Financial terms starting with “P”

113 terms · plain-language definitions for lifelong students and investors · Full glossary

P/B: Compares stock price to accounting book value. Below 1.0 can mean undervalued or in trouble. Most useful for banks and asset-heavy industries.
P/B Ratio: Price-to-Book ratio: share price divided by book value per share. P/B is the canonical asset-heavy-business multiple -- it works well for banks, insurers, and REITs where book value approximates the economic value of the balance sheet. Common misuse: applying P/B to asset-light businesses (software, consulting, brands) where the balance sheet captures almost none of the actual economic value. A SaaS company at P/B of 30 is not necessarily 'expensive' -- its real assets (engineers, customer relationships, codebase) aren't on the balance sheet at all. P/B is also distorted by buybacks, which shrink book value mechanically.
P/E (Fwd): Same idea as P/E, but uses analyst forecasts instead of past earnings. If Fwd P/E is lower than TTM, analysts expect earnings to grow.
P/E (TTM): How many dollars investors pay per $1 of earnings (last 12 months). A P/E of 20 means the market pays $20 for each $1 earned. Compare within the same sector, not across them.
P/E Ratio: Price divided by Earnings Per Share — how much investors pay for each dollar of profit. A P/E of 20 means the stock costs $20 for every $1 the company earns annually. Compare within the same industry for a meaningful benchmark.
P/S: Stock price relative to revenue. Handy when earnings are negative. A blunt tool \u2014 always pair it with margin analysis.
P/S Ratio: Price-to-Sales ratio: market cap divided by trailing twelve-month revenue. P/S is the metric of last resort for unprofitable companies where P/E is undefined or meaningless -- early-stage software, biotech before drug approval, growth-stage e-commerce. Common misuse: comparing P/S across industries with structurally different margin profiles. A 5x P/S is cheap for a 90%-gross-margin software firm and expensive for a 3%-net-margin grocer. Always pair P/S with gross-margin context before concluding the multiple is high or low.
Par Spread: The annual premium (quoted in basis points of notional per year) that makes the present value of expected protection payments equal the present value of expected default payments on a CDS, given an assumed recovery rate. Textbook approximation: par spread approximately equals PD x (1 - recovery), where PD is the annualized default probability. For a 200 bp CDS with 40% recovery the implied annualized PD is roughly 200 / (1 - 0.40) / 10000 = 3.33%. Real dealer pricing uses survival-probability curves calibrated across multiple maturities rather than the single flat approximation.
Par Value: The face value or nominal value of a bond or stock, as stated in the issuing company's charter or on the certificate. For bonds, par is typically $1,000 and represents the amount repaid at maturity. For common stock, par is often $0.01 or $0.001 \u2014 a legal minimum with little economic meaning. Premium bonds trade above par; discount bonds trade below par.
Parallel Shift: A yield-curve move where rates at every maturity change by the same amount -- e.g., all rates from 2yr to 30yr increase by exactly 25 bps. Parallel shifts are mathematically convenient but empirically rare; most actual curve moves involve different changes at different maturities. Effective duration measures sensitivity to parallel shifts; key-rate duration measures sensitivity to non-parallel shifts.
Parametric VaR: A VaR calculation method that assumes returns follow a normal distribution and uses statistical formulas (mean and standard deviation) to estimate the loss threshold. Fast and simple but unreliable for fat-tailed assets like options, emerging market bonds, or concentrated portfolios.
Passenger Yield: Passenger revenue divided by revenue passenger miles (the miles flown by paying passengers), in cents -- roughly the average fare collected per mile of travel sold. Rising yield means passengers are paying more per mile. Yield runs higher on short routes and lower on long-haul, so compare yields between similar route networks, and read it with load factor for the full revenue picture.
Passive Investing: An investment strategy that seeks to match market returns by holding a diversified index fund rather than selecting individual securities. Over 15-year periods, approximately 90% of actively managed funds underperform their passive benchmark after fees. Jack Bogle founded Vanguard on this principle.
Pay Yourself First: The personal finance discipline of directing a fixed portion of each paycheck to savings or investments before paying any discretionary expenses. Automating transfers on payday removes the temptation to spend first. Most financial planners suggest targeting 15\u201320% of gross income for retirement, with additional savings for near-term goals.
Payment-in-Kind: Interest paid in additional debt notes rather than in cash; abbreviated PIK. PIK interest accrues and compounds at the PIK rate, increasing the principal balance over time. PIK can be optional (toggle) or mandatory (the entire coupon is PIK-only until maturity). PIK is mechanically a future claim on the company's enterprise value at exit; if the company recovers, PIK is repaid via refinancing; if not, the inflated PIK balance squeezes equity recovery in any restructuring scenario.
Payout Ratio: The percentage of earnings paid out as dividends. A 40% payout ratio means the company pays $0.40 of every $1 earned as dividends and retains $0.60. Very high ratios (90%+) may be unsustainable if earnings dip.
Pecking-Order Theory: Myers + Majluf 1984 framework explaining the empirical preference for internal finance > debt > equity. Information asymmetry between managers and outside investors makes equity issuance the most expensive financing source (the market discounts new equity to compensate for what managers might know that investors do not), so firms exhaust internal cash + debt capacity before they ever issue equity. Predicts the empirical negative correlation between profitability and leverage (profitable firms self-fund, low-leverage; unprofitable firms must borrow, high-leverage) — the single sharpest empirical test that distinguishes pecking-order from static tradeoff theory.
PEG Ratio: P/E ratio divided by the earnings growth rate. A PEG of 1.0 is often cited as fair value for the given growth rate. Under 1.0 may indicate undervaluation; above 2.0 suggests the growth is already priced in. Best used as a rough screen, not a precise valuation tool.
Pension Footnote: The 10-K disclosure (typically a multi-page appendix) that breaks down a defined-benefit pension plan's Projected Benefit Obligation, Plan Assets, funded status, and actuarial assumptions (discount rate, expected return, salary growth, mortality table). Off-balance-sheet liability often hides here — Buffett's 2007 Berkshire shareholder letter is the canonical primer. Read alongside AOCI to track unrecognized gains/losses.
Percentage of Completion: A method for recognizing revenue on long-term contracts (construction, defense) as work progresses rather than waiting until completion. Revenue recognized = total expected revenue × percent complete. Used in industries where projects span multiple accounting periods.
Percentage Rent: A rent structure in which the tenant pays a base rent plus a percentage of sales above a specified breakpoint. Percentage rent is most common in anchored retail centers, where it aligns the landlord with the success of the tenants business. The structure has historically given landlords an additional upside lever when retail sales rise above expectations, while also exposing landlords to downside when tenant sales decline. Percentage rent is one reason landlord financial disclosures often include same-center sales-per-square-foot trends alongside base-rent figures.
Performance Materiality: The amount set by auditors below the overall materiality threshold, to provide a buffer for aggregating smaller misstatements. If individual items are below performance materiality, they may still warrant attention when combined. It's the working threshold during audit fieldwork.
Performance Obligation: A promise in a contract to deliver a distinct good or service to a customer. Under ASC 606, revenue is recognized when (or as) each performance obligation is satisfied. A software license and its implementation service may each be separate performance obligations.
Period 0: The leftmost mark on a time line — meaning NOW, today. Period 1 is the END of period 1 (not the start). A 5-year investment runs from period 0 to period 5. Most loans, leases, and bond coupons pay at the END of each period, so the first cash flow lands at period 1, not period 0. The exception is an annuity-due (lease payments due at the start of each period), where the first arrow lands at period 0.
Permanent Difference: A tax vs. accounting difference that never reverses — such as tax-exempt interest income or non-deductible meals and entertainment. Permanent differences cause the effective tax rate to differ from the statutory rate but do not create deferred tax assets or liabilities.
Permitted Indebtedness Basket: A carve-out in a bond or loan indenture that allows the borrower to incur specified categories or amounts of additional debt without triggering a covenant violation. Common baskets include revolving credit lines, capitalized leases, and intracompany debt. Analysts scrutinize basket sizes because aggressive issuers use them to load up on additional debt outside the original leverage test.
Perpetuity: A stream of equal cash flows that continues forever. PV-perpetuity = C / r, where C is the constant payment and r is the discount rate. Derivation: take the PV-annuity formula and let n → ∞; the (1+r)⁻ⁿ term drives to zero, leaving C/r. Worked example: an endowment paying $40,000/year forever, earning 5% on its investments, requires PV = $40,000 / 0.05 = $800,000 to fund. The British Treasury issued perpetuity bonds called "consols" from 1751 to 2015. The math forgives the "forever" assumption because distant cash flows contribute almost nothing to PV at any positive discount rate (50 years out at 5% captures 91% of the perpetuity value; 100 years captures 99%).
Pigouvian Tax: A tax set equal to the marginal social cost of a negative externality, designed to make producers internalize a harm they previously imposed on third parties for free. Carbon taxes, tobacco taxes, congestion pricing, and alcohol excise taxes are all Pigouvian. The standard economic prescription for negative externalities; named for early-20th-century British economist Arthur Pigou. Investors should treat industries with large unpriced externalities as carrying probability-weighted future-Pigouvian-tax liability.
PIK Interest: Payment-In-Kind \u2014 interest paid by issuing more debt instead of cash. A sign the company can't afford cash interest. Common in stressed and distressed situations.
PIK Toggle: A payment-in-kind toggle feature in subordinated debt that gives the borrower the OPTION (sometimes unilateral, sometimes negotiated) to pay an interest period's coupon in additional debt notes rather than in cash. PIK rates are typically 100-200 bps higher than the matched cash-coupon rate (the company pays a premium for the flexibility). Structural intent: bridging tool for brief cash-flow disruptions. Practical signal: repeated PIK elections (two or more consecutive periods) are a strong distress signal, indicating the company cannot service the mezz coupon from current FCF and is capitalizing interest into growing principal — a debt-spiral pattern.
Pin Risk: The risk that a stock closes exactly at or very near an option's strike price at expiration, leaving the option seller uncertain whether the contract will be exercised. Pin risk is most dangerous for short options positions because the seller does not know their final position until after the market closes.
Pinning: The empirical tendency for an underlying to close near a high-open-interest strike at options expiration, attributed to a combination of dealer hedging flows and option-buyer profit-taking near the strike. Pinning is most visible in single-stock options around monthly expiration dates and at high-open-interest round-number strikes. The effect is statistically detectable but modest in magnitude; over-attributing day-of-expiration price action to pinning is a common pattern in retail commentary.
Pipeline Throughput: The physical volume of product actually moving through a midstream company's pipelines, gathering systems, and terminals in a period -- the operating heartbeat of the business, reported in physical units (natural gas in Bcf/d or BBtu/d, liquids in barrels per day). Because most midstream cash flows are fee-based -- the company earns a toll per unit moved, largely independent of the commodity price -- throughput is the volume half of revenue and the clearest read on how fully the asset base is being used. Rising throughput signals producers are drilling and the system is filling; falling throughput signals the opposite. Units differ from company to company, so throughput is best compared for a company against itself over time rather than raw across operators.
Pitch Memo: A structured written argument for or against a position, typically including thesis, catalyst, kill criteria, base / bull / bear cases with target prices, items for further diligence, and proposed size. Writing the memo forces specificity that talking through an idea does not, and exposes the thesis to outside readers who catch errors the analyst working alone cannot see. The standard format runs 1-3 pages for retail / personal use; institutional memos are often 5-15 pages plus appendices.
PITI: Principal + Interest + Taxes + Insurance — the four-component monthly housing cost lenders use to compute affordability ratios. PITI / gross monthly income ≤ 28% is the conventional housing-ratio cap; PITI + other debts ≤ 36% is the back-end ratio. PITI does NOT include HOA, maintenance, utilities, or PMI — true cost-of-ownership runs ~30–40% higher than the PITI quote.
Plan Assets: The pool of investments (equities, bonds, alternatives) held in trust to fund a defined-benefit pension's obligations. Reported at fair value at year-end. The expected long-term return on Plan Assets is an actuarial assumption that flows through pension expense — overstated assumptions reduce reported pension expense and inflate operating income, a classic earnings-quality red flag.
Plan of Reorganization: POR. The court-approved restructuring plan a Chapter 11 debtor proposes (or the creditors propose, in some cases) to exit bankruptcy. Specifies which creditors receive what -- some cash, some new equity, some new debt. POR projections are negotiated settlements, not unbiased forecasts; actual outcomes diverge in both directions.
Plausibility Creep: A failure mode in pre-mortem exercises where the analyst, asked to imagine a 50% loss, gravitates toward elaborate multi-driver scenarios (\"a recession AND a CEO change AND a regulatory delay\") rather than a single-driver story. Compound scenarios have low specific probability but feel more thorough to write; the corrective is to insist on a single most-plausible cause of the loss and to write the story of that one cause in detail. Single-driver stories are what actually happen and where the most useful pre-mortem signal lives.
PMI: Private Mortgage Insurance — required by lenders on conventional loans with less than 20% down payment, typically 0.3–1.5% of the loan amount per year added to your monthly payment. Protects the LENDER if you default; provides zero benefit to the borrower. Falls off automatically at 78% loan-to-value or can be requested at 80%. FHA loans have a similar MIP that does NOT auto-cancel.
POD Account: Payable-on-Death — a bank account or CD with a named beneficiary who receives the balance at your death without going through probate. Free to set up at any bank; simply fill out a form designating the payee. Useful for keeping liquid assets out of the probate court process. Roughly equivalent to TOD (Transfer-on-Death) for brokerage accounts. Beneficiary designations override your will.
Politically Exposed Person (PEP): A current or former senior foreign political figure (head of state, senior politician, senior government official, senior judicial or military official, senior executive of a state-owned company), their immediate family members, and their close associates. PEP status is NOT itself a disqualifier from being a client, but it triggers ENHANCED due diligence: senior-management approval to open the account, ongoing enhanced transaction monitoring, periodic source-of-wealth review, and documented justification for the relationship. The enhanced scrutiny reflects the higher historical correlation between PEP status and corruption-derived funds. Domestic PEPs are subject to less stringent requirements than foreign PEPs under US rules but increasingly receive elevated scrutiny under international AML best practice.
Pooling Equilibrium: A market outcome in which all customer types (or all worker types, or all borrower types) accept the same contract priced at the population average. Pooling equilibria require either a participation mandate or sufficient information opacity to prevent the safer types from exiting; without those conditions, voluntary pooling typically unravels per the Akerlof lemons dynamic. Community-rated health insurance with an individual mandate and government-backstopped flood insurance are common real-world pooling structures.
Porter Five Forces: A 1979 framework from Harvard's Michael Porter for analyzing industry structure: bargaining power of buyers, bargaining power of suppliers, threat of new entrants, threat of substitutes, and intensity of rivalry. The framework sets the long-run ceiling on the margins and returns a business can sustain. Use it as a checklist before building a DCF or selecting peer multiples -- not as a forecast (it cannot predict technology shifts).
Portfolio Balance Effect: How central bank asset purchases change the mix of available investments, pushing investors into riskier assets and lowering yields across the board as safer bonds become scarce. It is a key transmission mechanism of quantitative easing beyond its direct effect on the bonds purchased.
Portfolio Drift: The natural divergence of a portfolio's actual asset weights from its target weights as different asset classes earn different returns. After a strong equity year, a 60/40 portfolio drifts toward 65/35 or 70/30; after a credit-market shock, the bonds outperform and the portfolio drifts the other way. The IPS's rebalancing bands define the threshold at which drift triggers action (commonly +/-5 percentage points).
Portfolio Inflows: Cross-border purchases of bonds, equities, and other financial securities by non-resident investors. Portfolio inflows are the most reversible form of capital inflow -- foreign investors can liquidate a bond or equity position in days, unlike a controlling FDI stake. Countries running current account deficits funded primarily by portfolio inflows are structurally more vulnerable to sudden stops because the financing can disappear quickly when global risk appetite shifts.
Portfolio Insurance: A 1980s strategy that promised to limit a portfolio's losses by automatically selling stock-index futures whenever prices started to fall. Prudent-sounding for a single investor, it became dangerous when many large institutions ran the same automatic rule at once: a modest decline triggered mass programmed selling, which drove prices lower, which triggered still more selling. This feedback loop was a central cause of the 1987 Black Monday crash, after which portfolio insurance fell out of favor.
Portfolio Weight: The percentage of your total portfolio invested in a single holding. A $10,000 holding in a $100,000 portfolio has a 10% weight. Weights drift as prices change, which is why rebalancing is needed to maintain your target allocation.
Portfolio-Fit Screen: The second-pass test on whether adding a position improves the portfolio relative to what is already owned -- accounting for sector concentration, correlation between positions, factor tilts, and total drawdown sensitivity. A name with strong per-name conviction can fail the portfolio-fit screen if it is highly correlated to existing positions; the right answer in that case is smaller size, paired hedge, or pass. The portfolio-fit screen is most valuable when it surfaces correlations the sector classification missed (REIT + homebuilder + regional bank all correlate through rates even though they sit in three different sector codes).
Position Sizing: The decision of how much capital to allocate to a given investment, expressed as a percentage of the portfolio. Position sizing should reflect conviction level, expected value, downside magnitude, and correlation with existing holdings. Over-sizing a correct but volatile position can still cause meaningful drawdowns; under-sizing a high-conviction idea wastes the edge.
Positive Leverage: When a property's cap rate exceeds the borrowing rate — so using debt improves cash returns on equity. At a 6% cap rate borrowing at 4%, leverage boosts equity returns. Positive leverage disappears when borrowing costs rise above the cap rate, making debt a drag on returns.
Post-Money Valuation: The valuation of a company immediately after receiving new investment — pre-money valuation plus the amount raised. Used to determine investor ownership percentage: amount invested / post-money valuation. If you invest $10M at a $40M pre-money, the post-money is $50M and you own 20%.
Post-Mortem: A structured review after a position is closed, examining what the thesis said, what actually happened, which assumptions held and which broke, and what was learnable for future work. Post-mortems are the source of compound improvement in an analyst's process over time; without them, the same errors recur because nothing forces the analyst to look back. The discipline is to write a brief post-mortem on EVERY closed position -- winners and losers -- because winners are where overconfidence accumulates.
Post-Reorg Equity: New equity issued to former creditors when a company emerges from Chapter 11 bankruptcy. The buyer base (credit funds rebalancing back to credit) creates systematic selling pressure for 6-12 months, producing the post-reorg-emergence trade pattern. Distinct from speculative bets on equity-in-bankruptcy (which is typically wiped at emergence).
Postpaid Phone Churn: The percentage of postpaid phone subscribers who cancelled in the period, per month -- how fast the base leaks. A carrier with 1.0% monthly churn loses roughly one in eight of its postpaid phone customers a year, and because winning a new subscriber costs far more than keeping one, small churn changes swing profitability hard. It is the cleanest read on customer satisfaction and competitive pressure. Compare only phone-to-phone churn: postpaid PHONE churn, postpaid ACCOUNT churn, and prepaid churn are different numbers a carrier can quote to flatter itself.
Postpaid Phone Net Adds: The net change in a carrier's postpaid phone subscribers in the period -- new phone lines added minus lines lost. Postpaid customers are billed at month-end (a contract or device-installment relationship), so they are the high-value, low-churn base carriers compete hardest for, and PHONE lines specifically are the flagship because they carry the highest revenue. It is the industry's headline growth number, but read it with churn: a carrier can post net adds by discounting so heavily that the customers it wins are worth less than the ones it keeps.
Power Law: The statistical distribution describing venture capital outcomes — a tiny fraction of investments (often 1-2%) generate the vast majority of returns for the fund. This is why VCs make many small bets hoping for outlier returns: one unicorn investment can return the entire fund.
PPI (Producer Price Index): Measures price changes at the wholesale or producer level before goods reach consumers. A leading indicator of consumer inflation (CPI) because rising production costs are often passed through to retail prices over the following weeks or months.
PRASM: Passenger Revenue per Available Seat Mile -- like RASM but counting only ticket (passenger) revenue, leaving out cargo and other income, in cents. It isolates the core flying business. PRASM equals yield times load factor, so it rises when planes get fuller, when fares go up, or both.
Pre-IPO Studies: Empirical DLOM studies measuring the discount at which a company's last private-round shares price versus its IPO price. Emory studies (1985-2002) and Willamette Management Associates studies typically show 30-40% discounts; the discount captures both the marketability premium of the IPO and the time-value-of-money over the period from private-round close to public listing. Used alongside restricted-stock studies as the empirical anchor for DLOM defense, particularly in valuations of companies with credible near-term IPO paths.
Pre-Money Valuation: The valuation of a company immediately before receiving new investment. If a VC invests $10 million at a $40 million pre-money valuation, the company was worth $40 million before the round. The new VC owns $10M / ($40M + $10M) = 20% of the company.
Pre-Mortem: A structured exercise in which an analyst, before opening a position, imagines that the position is already six months old and has lost 50% of its value, and writes a single specific story for how that happened. The retrospective framing surfaces hidden assumptions and risks that the prospective \"what might go wrong?\" framing does not -- writing the story forces specificity, and specificity exposes load-bearing assumptions the analyst did not realize were load-bearing. The exercise takes 30-60 minutes and is one of the highest-leverage things an analyst can do before sizing up.
Pre-Tax Contribution: Money diverted from gross pay BEFORE federal income tax (and usually state/FICA) is calculated — 401(k) traditional contributions, HSA, FSA, traditional IRA payroll deduction. Reduces your taxable income for the year, so a $1,000 pre-tax contribution costs ~$700–$760 in net pay (depending on your bracket). The trade-off is that traditional 401(k)/IRA withdrawals in retirement are taxed as ordinary income; Roth contributions skip the up-front benefit for tax-free growth.
Precautionary Saving: Extra saving a household holds to cushion against uncertain future income -- distinct from saving for a planned goal like retirement or a house down payment. The buffer grows with both the variance of expected income and the degree of concavity in the household's utility function (technically, the third derivative called prudence). Precautionary saving is why income-volatile households save more than income-stable ones with the same average income, and why portfolio cash buffers should grow when career or business income becomes lumpier.
Precedent Transactions: Historical M&A deal multiples used as a valuation reference for a target by comparing what acquirers HAVE paid for similar businesses. The third pillar of valuation alongside trading comps and DCF, and the noisiest of the three because precedent data bundles strategic vs financial buyer types, vintage effects, synergy assumptions, and control premiums into a single multiple. Best sourced from SDC Platinum, SEC filings (8-K, proxy, S-4), and Bloomberg M&A; should be re-bucketed by buyer type, vintage, and deal size before computing a median.
Preferred Stock: A class of shares with superior rights to common stock — typically including liquidation preferences, anti-dilution protection, and sometimes dividends. VC and PE investors typically receive preferred stock. In normal operations, preferred stock often converts to common shares automatically at an IPO.
Premium: The fixed monthly amount you pay an insurer to maintain coverage — paid whether or not you use any care. Employer plans typically split premium 70/30 employer/employee for individual coverage; family coverage premium can be $400–$800/month employee-share even with employer subsidy. Pre-tax via a Section 125 plan, which lowers federal/state/FICA. Premium is the cost-of-entry; deductible / coinsurance / copay are the cost-of-use.
Premium Bond: A bond trading at a price above its face (par) value, typically because its fixed coupon is above the market interest rate for bonds of similar risk and maturity. The higher price is what brings its yield-to-maturity into line with current rates: the price pulls down toward face value over the remaining life of the bond, offsetting the above-market coupon. For a premium bond, the ordering is: coupon rate > current yield > YTM.
Premium to NAV: When a BDC (or closed-end fund) trades above its per-share net asset value. Premiums signal investor confidence in the manager's deal flow, credit quality, or fee structure — but they also mean you are paying more than book value for the portfolio, reducing your downside cushion.
Prepaid Expense: Cash paid in advance for future benefits — insurance premiums, rent deposits, software subscriptions. Recorded as an asset, then expensed as the benefit is consumed. A large prepaid expense balance means the company has paid for future periods.
Prepaid Rent: Rent paid before the period it covers, recorded as an asset and expensed when the paid-for period is used. The mirror image of deferred rent: prepaid rent means cash ran ahead of expense. Under ASC 842, prepaid amounts on capitalized leases increase the right-of-use asset; the classic stand-alone asset persists mainly for short-term leases kept off the balance sheet.
Prepayment Risk: The risk that mortgage holders refinance early when interest rates fall, returning principal to investors sooner than expected and forcing reinvestment at lower prevailing rates. It is the primary risk in mortgage-backed securities and is why MBS yields include a premium over comparable Treasuries.
Present Value: What a future sum of money is worth today, after discounting for the time value of money and risk. Formula: PV = FV / (1 + r)^n. A dollar received in 10 years at a 7% discount rate is worth about $0.51 today. All of DCF valuation rests on present value math.
Price Discrimination: Charging different customers different prices for essentially the same product, generally to capture more of the consumer surplus that would otherwise leak away under a uniform price. Three degrees: first-degree (each customer charged their reservation price; auctions and bespoke contracts), second-degree (menu of self-selecting tiers; software pricing), and third-degree (different groups; student, senior, geographic). All three convert consumer surplus into producer surplus.
Price Elasticity: The percentage change in quantity demanded that follows a one-percent change in price. Elastic demand (>1) means quantity falls sharply when price rises — typical of products with substitutes or low loyalty. Inelastic demand (<1) means quantity barely moves — typical of essentials, addictions, brand-loyal products, and businesses with pricing power. Elasticity is the quantitative measure of pricing power; the most attractive businesses to own are the ones with structurally low elasticity.
Price Talk: The price range published by IPO underwriters in advance of pricing, indicating where the deal is expected to land. Price talk is iterative: the initial range is set when the S-1 amendment publishes it, and the range may be revised upward or downward during the roadshow as bookbuilding demand comes in. The final offer price (set the evening before trading) may be at, above, or below the price-talk range depending on demand.
Price Target: An analyst's estimate of where a stock's price will be in roughly 12 months; the consensus target is the average across all analysts covering the stock. Treat it as an informed opinion, not a promise -- targets are revised constantly and often simply follow the price.
Price-Time Priority: The matching rule used by every major US equity exchange: better-priced orders execute first, and among orders at the same price, the one that arrived earliest executes first. There is no other tiebreaker -- not the size, not the broker, not the customer. The rule is what makes the matching engine impersonal, fast, and deterministic; it is also why colocation and low-latency infrastructure matter to professional trading firms.
Price-to-Sales (P/S): Market cap divided by annual revenue. Useful for unprofitable growth companies where P/E doesn't work (no earnings). A blunt tool \u2014 always pair with gross margin analysis. A SaaS company with 80% margins and 5\u00d7 P/S is very different from a retailer with 5% margins at the same multiple.
Price/FFO: A valuation multiple for REITs: market price per share divided by FFO per share. The REIT equivalent of P/E for operating companies. REITs with higher growth, better asset quality, or external management trade at premium Price/FFO multiples.
Primary Beneficiary: The entity that must consolidate a Variable Interest Entity (VIE) because it absorbs the majority of the VIE's expected losses or receives the majority of its expected residual returns. Determining the primary beneficiary requires judgment about who truly controls and bears the risks of the VIE.
Primary Research: Information gathered directly from first-hand sources — channel checks with customers or suppliers, expert interviews, site visits, proprietary surveys, or direct contact with management. Primary research provides an edge because it generates information that is not yet reflected in public filings or sell-side reports.
Principal-Agent Problem: The structural conflict that arises whenever a principal (owner, shareholder, depositor, insurer) hires an agent (manager, executive, borrower, insured) to act on the principal's behalf but cannot fully observe the agent's actions. The agent has both information and discretion the principal lacks, creating moral hazard. Contract design -- performance pay, long-vesting equity, clawback provisions, deductibles, capital requirements -- attempts to re-align incentives without removing the agency relationship that creates value.
Prisoners Dilemma: A game in which two players each have a dominant strategy to "defect" (cut prices, race to market, refuse cooperation), and so both end up at an outcome that is worse for both than if they had cooperated. The dilemma is the foundational explanation for why margins erode in symmetric, undifferentiated industries (airlines, gas stations, commodity producers) — individually rational moves produce a collectively irrational outcome and cartels that would escape it are typically illegal.
Private Mortgage Insurance (PMI): Insurance required by lenders when the down payment is less than 20% (LTV above 80%). PMI protects the lender if you default. It typically costs 0.5–1.5% of the loan amount annually and can be removed once equity reaches 20%. An often-overlooked cost of small down payments.
Private Saving: Household and business saving -- after-tax income minus consumption, plus retained corporate earnings. Private saving is one of the two components of national saving in the income identity (the other is public saving). Sustained shifts in private saving have macro consequences: a household-sector deleveraging episode (as after 2008) raises private saving sharply, which can offset large government deficits without forcing currency or rate adjustment.
Pro / DIY Mix: The split of a home-improvement retailer's sales between professional customers (contractors, builders, tradespeople) and do-it-yourself consumers, usually shown as the percentage from Pro. The mix matters because the two customers behave differently: Pro spending is larger, more frequent, and more tied to the construction and repair-remodel cycle, while DIY is smaller-basket and more consumer-sentiment-driven. Retailers have invested heavily to win more Pro share because Pro customers are stickier and higher-volume, so a rising Pro mix is generally viewed as a sign of a strengthening, more durable customer base.
Pro-Rata Rule: IRS rule that treats all your Traditional IRAs (across providers) as one pool when computing the taxable portion of any Roth conversion. If you have $93K of pre-tax money + $7K non-deductible across all Traditional IRAs and convert $7K, only 7% of the conversion is tax-free — the other 93% is taxed even though you "earmarked" the non-deductible $7K. Solo-401(k) "reverse rollover" of pre-tax IRA balance is the standard workaround for backdoor-Roth users.
Probability of Finishing ITM: The market-implied likelihood, under risk-neutral pricing, that an option will have any intrinsic value at expiration. Delta on a call approximates this probability directly: a 0.30-delta call is roughly a 30 percent chance of finishing above strike, a 0.70-delta call is roughly a 70 percent chance. The mapping is approximate (it ignores volatility skew and small higher-order terms) but it is the single most useful reading of delta for a retail investor sizing a directional bet -- read the column as odds, then ask whether the premium is fair given those odds.
Probate: The court process that validates a will and supervises distribution of assets that DON'T have beneficiary designations or transfer-on-death registration. Costs 3–7% of estate value, takes 6–18 months, and is public record. Avoiding probate is the main reason people use trusts, joint titling, beneficiary designations, and POD/TOD accounts. For a 22-year-old: just make sure 401(k)/IRA/life-insurance beneficiaries are current and you'll bypass probate on the bulk of your assets.
Process vs Outcome: The practitioner discipline of grading investment decisions on two independent axes: was the analytical process sound (thesis well-constructed, evidence quality high, falsification trigger named in advance) AND was the realized outcome good (positive P&L net of opportunity cost). The two axes generate a four-quadrant scoring matrix that separates skill from luck. Most retail investors implicitly collapse the matrix into a single P&L axis and learn the wrong lessons from both lucky wins and unlucky losses.
Producer Surplus: The gap between the price the seller received and the minimum price they would have been willing to accept (their cost), summed across all sellers in a market. Visualized as the triangle below the market price and above the supply curve. Producer surplus IS gross profit in geometric form, and widening it through pricing power or cost discipline is the entire game of margin expansion.
Production Possibilities Frontier: A curve showing every combination of two goods (or two uses of capital) an economy can produce when all resources are fully employed. Points on the curve are efficient; points inside are wasteful; points outside are impossible. The slope at any point is the opportunity cost of producing one more unit of one good in terms of the other — the visual form of the scarcity-and-trade-off principle.
Profit Margin: Net income divided by revenue — the percentage of each dollar of sales that becomes profit. Often used interchangeably with "net margin." Expanding profit margins are a sign of improving efficiency or pricing power; contracting margins signal cost pressure or competition.
Projected Benefit Obligation: PBO — the present value of pension benefits employees have earned to date, projected forward for expected future salary increases. Discounted at a high-quality corporate bond rate. Compared against Plan Assets to compute Funded Status: if Plan Assets < PBO, the plan is underfunded and a net liability appears on the balance sheet (since SFAS 158 / ASC 715).
Promote: In real estate and PE fund structures, the GP's share of profits above a preferred return -- functionally equivalent to carried interest in standard PE waterfalls. Promote structures often include a hurdle, a catch-up, and a final split (e.g., 8% pref, 50/50 catch-up, 80/20 split above) and align the GP's incremental return to the LP achieving the pref first. Used interchangeably with carry in many real estate funds and some PE fund structures.
Property Cycle: The four-phase cycle of real estate markets: recovery (rising demand, falling vacancy), expansion (new construction begins), oversupply (too much new space delivered), and recession (vacancy rises, rents fall). Understanding where a property type sits in the cycle helps time REIT investments.
Property Sector Diversification: Spreading REIT investments across different property types — office, industrial, retail, residential, healthcare — to reduce concentration in any single real estate market segment. Industrial has very different risk characteristics than retail or office.
Prospect Theory: The Nobel Prize-winning psychological model (Kahneman and Tversky, 1979) showing that people evaluate gains and losses asymmetrically — losses feel about twice as painful as equivalent gains feel good. Prospect theory explains why investors hold losing stocks too long and sell winners too early.
Prospective Application: Applying a change only to current and future periods — no restatement of prior results. Used for changes in accounting estimates and some changes in principle when retrospective application is impractical. Easier but reduces period-to-period comparability.
Prospectus: The marketing-document portion of an SEC registration statement that's distributed to potential investors before a securities offering (IPO, secondary, or bond issuance). For an IPO it's the front half of the S-1. Section 10 of the Securities Act of 1933 sets the minimum disclosure requirements; in practice modern prospectuses run 200-400 pages and the substance lives in the financials + risk factors.
Protective Put: Buying a put option on a stock you own to limit downside loss. Functions like portfolio insurance — you pay the premium and guarantee you can sell at the strike price no matter how far the stock falls. The cost is the put premium, which reduces your net return.
Provenance: The documented chain of ownership from artist (or producer) to current seller. The bedrock of authentication in the art market: a clean provenance (every owner documented from artist to today) supports authenticity claims; a gap in provenance is correlated with forgery risk, looted-property risk, and authentication-dispute risk. Auction houses publish provenance summaries in catalogs; the depth of detail correlates with the asset's market value.
Proxy Statement: Same as DEF 14A. The 'PRE 14A' is the preliminary version filed before the definitive (DEF) filing; the 'DEFA14A' is supplementary materials filed between the proxy statement and the meeting.
Public Good: A good that is non-rivalrous (one person's use does not diminish another's) AND non-excludable (you cannot stop non-payers from benefiting). National defense, lighthouses, basic research, and clean air all fit. Public goods are typically under-supplied by private markets because of the free-rider problem and so are commonly provided or subsidized by governments. The distinction is structural, not moral — it predicts which sectors require non-market provision.
Public Saving: Government revenue minus government spending -- positive when the government runs a surplus, negative when it runs a deficit. Public saving is one of the two components of national saving alongside private saving. When public saving is deeply negative and private saving does not rise to compensate, the saving-investment identity forces either lower domestic investment, a larger current account deficit, or both.
Public Service Loan Forgiveness: A federal program (PSLF) that cancels the remaining balance on Direct loans after about ten years (120 qualifying monthly payments) of full-time work for a government or qualifying non-profit employer.
Purchasing Power: The quantity of goods and services a dollar can buy. Inflation erodes purchasing power over time. $100 in 1990 buys what ~$230 buys in 2024 at average CPI inflation. Maintaining and growing purchasing power \u2014 not just nominal wealth \u2014 is the true goal of long-term investing.
Purchasing Power Parity: The theory that exchange rates should adjust over the long run so that the same basket of goods costs the same in every country. Useful for comparing living standards and economic size across nations, but exchange rates can deviate from PPP for many years in practice.
Pure-Play Comp: A comparable company whose business is concentrated in the SAME sub-sector and product mix as the target, with minimal exposure to adjacent businesses. A pure-play coatings manufacturer is a better comp for another coatings manufacturer than a diversified materials conglomerate that earns 30% of revenue from coatings. Pure-play status is one of the six practitioner criteria for comp selection and the single biggest driver of multiple-regime consistency across a peer set.
Put Option: A contract giving you the right to sell a stock at a set price before a set date. You profit if the stock falls below the strike price. Puts are often used as insurance to protect a portfolio against losses.
Put-Call Parity: The mathematical relationship between call prices, put prices, the stock price, and the risk-free rate for European options at the same strike and expiration. If parity breaks, arbitrageurs can earn riskless profits, so it holds very tightly in liquid markets.
Putable Bond: A bond that gives the holder the right to sell the bond back to the issuer at par (or a specified price) before maturity. Investors exercise puts when interest rates rise and bond prices fall, limiting downside. Putable bonds trade at lower yields (higher prices) because the put option has value. The right to put is the mirror image of the issuer's call right.

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