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Financial terms starting with “M”

M&A Auction
A structured competitive sale process in which the seller invites multiple pre-qualified bidders to compete for the right to acquire the target. The auction extracts more of each bidder's reservation price through staged information disclosure and competitive pressure. The three primary structures are single-buyer negotiation (no auction), targeted auction (5-10 bidders), and broad auction (30+ bidders). Empirically targeted and broad auctions produce 10-40% higher final prices than single-buyer negotiations for similar-quality targets.
M&A Premium
The percentage above a target company's pre-announcement share price that an acquirer pays in a merger or acquisition — typically 20 to 40 percent for US public company deals. The premium compensates target shareholders for transferring control. Acquirers must generate synergies exceeding the premium cost to create value; most research shows acquirers on average break even at best.
M2
A broad measure of the US money supply: currency in circulation plus checking-account deposits plus savings deposits plus money-market mutual fund balances. M2 is the most-watched money-supply aggregate because it captures most of what households and small businesses can actually spend. Sustained M2 growth materially faster than nominal GDP growth tends to precede inflation pressure; M2 contraction (rare in US history) signals significant credit-system stress.
MAGI
Modified Adjusted Gross Income — AGI plus certain deductions added back (most commonly: tax-exempt municipal bond interest, foreign-earned income exclusion, student-loan interest deduction, and IRA contributions for the deductibility test). Different IRS provisions use slightly different MAGI definitions; the Roth IRA / IRA-deduction MAGI is the one that matters for retirement-account eligibility. Your tax software computes this; the 1040 itself does not show MAGI as a line.
Maintenance Margin
The minimum account balance required to keep a leveraged position open. If losses erode the account below this threshold, the broker issues a margin call requiring the investor to deposit additional funds or face forced liquidation of the position.
Managed Float
An exchange rate regime in which the central bank lets market forces drive the currency most of the time but intervenes occasionally to smooth large moves or lean against extreme appreciation or depreciation. Many emerging-market central banks operate managed floats explicitly or de facto. The regime preserves partial monetary independence and partial exchange-rate stability, at the cost of reserve usage and some predictability in policy reactions.
Management Fee
The annual fee paid by limited partners to the general partner for ongoing fund management, typically 1.5-2.0% of committed capital during the investment period (years 1-5), often stepping down to 1.0-1.5% on invested capital during the harvesting period (years 6-10). Total fund-level economic burden over a typical 10-year fund: 12-15% of committed capital. The management fee comes directly out of LP capital and is the largest single ongoing fee burden in a PE fund. LP scrutiny in 2024-2025 institutional terms focuses heavily on step-down provisions and committed-vs-invested-capital base.
Mandatory Amortization
The contractually-required principal repayment on a debt tranche, paid on a defined schedule regardless of the borrower's discretion. Term Loan A typically amortizes at 5-10% per year on a straight-line basis; Term Loan B amortizes at 1% per year with a bullet repayment at maturity (the standard cov-lite structure); Senior Notes typically have no amortization with bullet repayment at maturity. Mandatory amortization is distinct from optional prepayment (which is at the borrower's discretion) and cash-sweep prepayment (which is contractually required when a leverage trigger is hit).
Manufactured Variance
A term of art for deliberately constructing a position that generates performance only if a specific, non-consensus outcome occurs. A manufactured variance trade has tight scope: it is not a bet on the general direction of the stock but on one identified driver — a margin inflection, a product cycle, a regulatory decision — that the market is not pricing correctly.
Margin Call
A demand from your broker to deposit more money into your account because your leveraged position has declined in value below the maintenance margin level. If you cannot meet the margin call, the broker has the right to immediately liquidate some or all of your position to reduce the firm's exposure.
Margin of Safety
The gap between the price you pay and your estimate of a stock's intrinsic value. Two framings are taught: (1) the first-order mechanic — (Intrinsic Value − Price) ÷ Intrinsic Value against your central estimate (see pfvi-11); (2) the disciplined form — the same formula run against a CONSERVATIVE estimate, the bear-end of your honest range rather than the central point (see pfvi-16). Graham's 33% discount rule and Buffett's bridge metaphor (build it for 30,000 pounds, only drive 10,000-pound trucks across) both refer to the disciplined form: the conservative-case margin is what protects you when your analysis is wrong or the world turns harsher.
Marginal Analysis
The practice of evaluating decisions one unit at a time — what does the NEXT dollar, hour, or customer add? Disciplined investors and CEOs deploy resources up to the point where marginal benefit equals marginal cost and stop there. Marginal analysis is the operational form of opportunity cost: total figures (revenue, profit, capital) describe what happened, but margins are the only thing that should drive the next decision.
Marginal Benefit
The additional value (utility, profit, satisfaction) obtained from one more unit of an activity. Comparing marginal benefit to marginal cost is the universal disciplined decision rule: keep going as long as marginal benefit exceeds marginal cost, stop the moment they cross. Failing this comparison is how individuals over-invest in losing positions and how companies fund value-destroying expansion projects.
Marginal Contribution to Risk
How much each position adds to the total portfolio risk. A position's marginal contribution depends on its own volatility AND its correlation with the rest of the portfolio. High-correlation positions contribute more risk per dollar than low-correlation ones, even at the same size.
Marginal Cost
The cost of producing one ADDITIONAL unit, distinct from the average cost of all units so far. Marginal cost drives almost every economic decision: airlines sell the last seat for $50 because the marginal cost is near zero; software companies expand because the marginal cost of one more user is trivial. Average cost is a lagging accounting figure; marginal cost is the forward decision rule.
Marginal Position
The position being evaluated for addition to a portfolio that already holds other names. The right size for a marginal position is determined by its standalone conviction AND its contribution to portfolio-level risk -- not by standalone conviction alone. A high-conviction marginal position in an already-concentrated sector cluster may merit half its standalone size; a moderate-conviction marginal position that diversifies an over-concentrated portfolio may merit larger size than its standalone conviction would suggest. The marginal-position frame is the operational form of the portfolio-fit screen.
Marginal Propensity to Consume
MPC. The fraction of an additional dollar of income that a household spends rather than saves. Lower-income households typically have higher MPCs (often above 0.8) than higher-income households (often near 0.3-0.5), which is why tax cuts targeted at low-income households tend to produce larger short-run stimulus per dollar. The MPC is one of the structural parameters that determines the size of the fiscal multiplier.
Marginal Revenue
The additional revenue earned from selling one more unit. Under perfect competition marginal revenue equals price; under any form of market power marginal revenue falls below price because increasing sales requires lowering price on every prior unit too. The intersection of marginal revenue and marginal cost is the profit-maximizing output level — the textbook rule for both monopolies and competitive firms.
Marginal Tax Rate
The tax rate a company would pay on its NEXT dollar of taxable income, distinct from the effective tax rate (which is total tax / pre-tax income on already-realized income). The marginal rate is the right input for WACC in a forward DCF because the tax shield on incremental debt is computed at the marginal rate. The effective tax rate often differs from the marginal rate due to one-time credits, R&D credits, foreign-tax credits, or jurisdiction-specific permanent differences -- relying on effective rate flatters after-tax cost of debt and understates WACC.
Mark-to-Market
Valuing an asset at its current market price rather than its original cost. Produces up-to-date financial statements but creates income statement volatility when prices fluctuate. Trading securities and many derivatives are marked to market every reporting period.
Mark-to-Model
Valuing an asset using an internal pricing model when no active market exists — the same as Level 3 fair value. Prone to manipulation because the inputs are unobservable. Critics call it "mark-to-myth" when models are disconnected from economic reality.
Market Cap
The total market value of the company (price \u00d7 shares). Conventions vary; this platform uses Mega \u2265 $200B, Large $10\u2013200B, Mid $2\u201310B, Small $300M\u2013$2B, Micro <$300M. (MSCI and S&P use different cutoffs.)
Market Capitalization
The total dollar value of all a company's shares — share price multiplied by total shares outstanding. It's the market's current price tag on the whole company. Sizes range from micro-cap (under $300 million) to mega-cap (over $200 billion).
Market Order
An order to buy or sell immediately at the best available current price. For a liquid index fund or ETF it fills instantly and the tiny bid-ask spread is negligible, which makes it the simplest sensible choice for a long-term buyer.
Market Price
The current price at which a stock or other security is trading in the open market, determined by the interaction of buyers and sellers. Market price reflects collective investor opinion of a company's value but can diverge substantially from intrinsic value for extended periods. Benjamin Graham famously noted that in the short run, the market is a voting machine; in the long run, it is a weighing machine.
Market Sentiment
The overall attitude of investors toward a particular security or the market as a whole \u2014 broadly categorized as bullish (optimistic) or bearish (pessimistic). Sentiment is measured by surveys (AAII, CNN Fear & Greed Index), options positioning (put/call ratio), fund flows, and short interest. Extreme sentiment often marks turning points: maximum pessimism can signal a bottom; maximum euphoria can signal a top.
Market Sizing
The Fermi-style discipline of estimating an addressable market from the build-up: count the population of potential customers in the relevant reference class, estimate the penetration rate (what fraction find the product relevant), estimate the average annual spend per customer, multiply. The build-up produces an order-of-magnitude TAM bound that can be compared against a memo's headline TAM claim; meaningful divergence (3x or more) is either the analyst knowing something the reader does not (worth digging into) or stretching to support a larger revenue opportunity than the market structure actually allows (worth pushing back on).
Marketability
The ease and cost of converting an equity stake to cash. A publicly-traded large-cap stock has near-perfect marketability (sell at quote, settle in T+1, minimal market impact). A private-company minority stake has near-zero marketability without a transaction event (no public market, no defined exit path, no buyer pool). The DLOM exists to value the gap between these two endpoints, calibrated to the specific marketability profile of the equity being valued.
Marketable Limit Order
A limit order priced AT or slightly ACROSS the current best quote, designed to fill immediately if the book is honest while stopping if the book is wider than expected. A buy limit at the current ask is marketable -- it sweeps up to that price and halts. Marketable limits are the standard professional default for any size that matters in any name that is not a top-tier ETF, combining most of the execution speed of a market order with a hard cap on the worst possible fill.
Matching Engine
The exchange software that pairs incoming buy and sell orders against the order book in millisecond timeframes, applying price-time priority and producing executed trades. The matching engine has no discretion -- it follows the rule mechanically. Modern engines at the largest exchanges process millions of orders per second and are tested for years before going live; an engine outage halts trading until the venue reverts to a backup or auctions the open queue.
Material Adverse Change
MAC. A defined contract term (common in M&A agreements, credit facilities, and bond indentures) for an event significant enough to materially worsen a company's financial position or business outlook. Triggering a MAC clause can let counterparties walk away from a deal or accelerate debt. The legal threshold for what qualifies is high -- Delaware courts have rarely granted MAC claims, but the disclosure question of whether an event 'rises to the level of a MAC' is asked every quarter.
Material Event
An event significant enough to a reasonable investor's decision-making to require SEC disclosure -- the operating threshold for an 8-K filing or for amending risk factors in a 10-Q. The Supreme Court's TSC v. Northway (1976) definition is the legal standard: a 'substantial likelihood' that disclosure 'would have been viewed by the reasonable investor as having significantly altered the total mix' of information available.
Material Nonpublic Information
Information that is BOTH material (a reasonable investor would consider it important in a buy/sell decision because it would or could move the price) AND nonpublic (not yet broadly disseminated to the market). Trading or tipping others on it — in either direction, regardless of your job title — is illegal insider trading when it was obtained through someone's breach of a duty of confidentiality. The lawful counterpart is the mosaic theory: assembling public and non-confidential pieces into a sharper conclusion is legitimate research even though it produces a real edge.
Material Weakness
A deficiency in internal controls significant enough that there is a reasonable possibility that a material misstatement of the financial statements will not be prevented or detected. More serious than a significant deficiency. Companies with material weaknesses face greater risk of accounting errors or fraud.
Materiality
The threshold at which an error, omission, or item in the financial statements is significant enough to influence a reasonable investor's decision. Typically benchmarked at 5% of pre-tax income for earnings misstatements. Both quantitative and qualitative factors determine materiality.
Maturity Wall
A chart showing when a company's debt comes due. A concentration of maturities in one year creates refinancing risk \u2014 especially if credit markets are tight.
Maximum Drawdown
The worst peak-to-trough loss an investment has suffered -- how far it fell from its high before recovering. A 100% stock portfolio has had drawdowns of 20%+ every several years and 50%+ in severe crashes like 2008. It measures the pain you would have had to sit through, which is often what makes investors panic-sell at the worst possible time.
MD&A
Management's Discussion and Analysis — the narrative section inside a 10-K or 10-Q where management explains what drove the numbers, what is changing in the business, and what risks lie ahead. MD&A is required disclosure, but tone and candor vary widely; reading several years side-by-side reveals how management frames deteriorating results.
Mean Reversion
The tendency of a variable — like implied volatility, credit spreads, or stock valuations — to return toward its long-term average after an extreme move. Mean reversion is one of the most exploited patterns in quantitative investing, though the timing of reversion is notoriously hard to predict.
Mean-Preserving Spread
A change in a probability distribution that holds the mean constant but increases the variance -- typically by shifting probability mass from the center toward the tails. The transformation makes the new distribution second-order stochastically dominated by the original: every risk-averse investor prefers the original (tighter) distribution. The concept is central to comparing risky payoffs without specifying a particular utility function.
Mei Moses Index
The longest-running academic art-market price index, originally created by Jianping Mei and Michael Moses, covering 30,000+ repeat-sales pairs back to 1875. Sold to Sotheby's in 2016 and now branded the Sotheby's Mei Moses index. Its long-run finding is that nominal art returns have been roughly equity-comparable, but the index has survivorship bias (excluding pieces that don't come back to market) that biases reported returns upward by 1-3% per year.
Memo Skim Pattern
The disciplined 10-minute reading order for a long-form investment memo: thesis paragraph first (does the author commit to a falsifiable view?), risk section second (did they grapple seriously with what would make them wrong?), valuation summary third (does the price reflect the numbers?), business-overview headings fourth (do they understand the unit economics?). The skim is the genre's native reading order regardless of the memo's physical pagination, and it produces a defensible first opinion fast enough to triage which memos repay deeper reading.
Mental Accounting
Treating money differently based on its source or intended use, even though all dollars are interchangeable. Examples: spending a tax refund freely while hoarding savings, or being willing to gamble with investment gains (house money) while being very conservative with principal.
Merger Arbitrage
The trade of going long a target and (in stock deals) short the acquirer once a merger is announced, capturing the deal spread between current price and deal-closing value. Spread compensates for time-value-of-money plus residual probability the deal fails. Empirical merger-arb funds (LMRK, MERFX) have generated single-digit annualized returns with bond-like volatility over multi-decade periods.
Mezzanine Debt
Subordinated debt in an LBO capital stack that sits below senior secured debt and above sponsor equity in the priority waterfall. Typical features: 10-15% all-in target return; cash coupon of 8-12% plus PIK toggle to 10-14%; equity kickers (warrants for 1-10% of fully-diluted equity); 7-10 year maturity; minimal maintenance covenants; subordinated security. Mezzanine bridges the gap between senior-debt cost of capital (mid-single-digit yields) and sponsor-equity cost of capital (20%+ target IRR). Used most heavily in mid-market LBOs where senior leverage maxes out below the sponsor's required equity check.
Middle Market
US companies with annual EBITDA typically between $10 million and $150 million (or revenues of $50M\u2013$1B). Middle-market companies are too small to issue bonds in the public market, making them dependent on bank loans and private credit providers like BDCs. They typically carry higher credit spreads than large leveraged loans due to lower liquidity.
Minority Interest
The slice of a consolidated subsidiary that the parent company does NOT own (also called noncontrolling interest). When a parent owns, say, 80% of a subsidiary, accounting rules still fold 100% of the subsidiary revenue and EBITDA into the parent statements -- so an enterprise value built on those consolidated numbers includes value that belongs to the other 20% owners. That is why the EV-to-equity bridge SUBTRACTS minority interest: your shareholders do not own that piece. It appears on the balance sheet within equity, as a separate noncontrolling-interest line.
MIRR
Modified Internal Rate of Return — corrects the reinvestment-rate fallacy embedded in IRR by explicitly assuming interim cash flows are reinvested at the cost of capital, not at IRR. MIRR also eliminates the multiple-roots problem when cash-flow signs alternate. Result: a single, realistic return number that ranks mutually exclusive projects in the same order as NPV.
Mispricing
A situation where the market price of a security differs materially from its intrinsic (fundamental) value. Mispricings can occur in either direction \u2014 overpriced (market optimism exceeds fundamentals) or underpriced (market pessimism ignores durable earnings power). Value investors seek to identify and exploit mispricings before the market corrects, with the understanding that the correction can take longer than expected.
Moat
A durable competitive advantage that protects a company's profits from competitors. Types include brand power (Coca-Cola), network effects (Visa), switching costs (enterprise software), patents, and cost advantages (Costco). Wide-moat companies can sustain high returns on capital for decades.
Modified Gross Lease
A lease structure in the middle ground between triple-net and gross. Typically the tenant pays some operating-expense categories (often property taxes and building insurance) while the landlord retains responsibility for others (often structural maintenance and capital expenditures). Modified gross dominates the office sublease market and many smaller-building leases where the pure-NNN structure is impractical and the pure-gross structure shifts too much risk to the landlord.
MOIC
Multiple on Invested Capital — total cash returned to LPs / total cash invested. A 2.5x MOIC means $1 invested became $2.50 in proceeds. Cleaner than IRR for comparing absolute dollar wealth-creation across deals of different durations: a 30% IRR over 2 years (1.69x MOIC) creates less wealth than a 20% IRR over 5 years (2.49x MOIC). Standard PE reporting pairs MOIC with IRR.
Monetary Policy
Central bank actions to control the money supply and interest rates in order to achieve economic goals. The Federal Reserve's main tools are the federal funds rate, open market operations (buying or selling bonds), and reserve requirements for banks.
Money Illusion
The cognitive tendency to think in nominal dollar terms rather than real (inflation-adjusted) terms. A raise from $50,000 to $52,000 feels like a gain even when inflation runs 5% — real purchasing power fell. In investing, money illusion causes investors to anchor to nominal returns and underestimate the corrosive effect of inflation on long-term wealth.
Money Market
The market for short-term debt instruments — Treasury bills, commercial paper, repo, and certificates of deposit with maturities under one year. Money market funds invest in these instruments. This market provides essential short-term liquidity to corporations, banks, and the government.
Money Multiplier
The textbook relationship between central-bank reserves and the broader money supply: if banks hold reserves equal to fraction r of deposits, then $1 of new reserves can in principle support up to $1/r of total deposits through chained lending. The model assumes reserves are scarce and binding. In the ample-reserves regime since 2008 -- and especially after required reserves went to zero in 2020 -- the multiplier no longer describes how money is created; capital ratios and credit demand bind instead. The multiplier remains useful as historical context and a textbook stepping-stone, not as a description of current system mechanics.
Money Supply
The total stock of money circulating in an economy. Definitions narrow (M0, M1) and broaden (M2, M3) by including progressively less-liquid instruments. M2 is the most widely cited US measure: currency in circulation plus checking accounts plus savings deposits plus retail money-market funds. The money supply expands when banks make loans (creating new deposits) and contracts when loans are paid down or written off; the Fed influences the price of money (rates) more directly than the quantity.
Money-Weighted Return
The internal rate of return on the actual cash flows into and out of an account; it weights each period by how much money was invested at the time. It captures the investor's real dollar experience, including the effect of their own timing, so it can differ sharply from the time-weighted return: add money just before a bad stretch and your money-weighted return is far worse than the manager's reported time-weighted figure, even though both numbers are correctly calculated.
Moneyness
An option's relationship to the current stock price. A call is in-the-money when the stock is above the strike, at-the-money when the stock sits at the strike, and out-of-the-money when the stock is below it; puts mirror that geometry. Moneyness governs how much of the premium is intrinsic vs. time value, what the delta looks like, and roughly what the market thinks the odds of finishing ITM at expiration are. Reading the option chain as a moneyness ladder is the literacy skill that lets a retail trader pick strikes by probability instead of by feel.
Monitoring Fee
An annual fee of $0.5M-$3M paid by the portfolio company to the GP for ongoing oversight services. Charged over the hold period, with cumulative monitoring fees on a 5-7 year hold typically reaching $5M-$15M per portfolio company. The fee is paid from portfolio-company cash (same indirect-LP-cost structure as transaction fees), and is typically included in the fee-offset provision. Monitoring-fee acceleration on early-exit deals has been a frequent SEC enforcement target since 2015; institutional LPs scrutinize monitoring-fee disclosure rules and acceleration provisions in the LPA closely.
Monte Carlo Simulation
A risk modeling technique that generates thousands of random scenarios using specified distributions and correlations to simulate a range of possible portfolio outcomes. More flexible than parametric methods and can model complex non-linear risks, but requires careful assumption-setting.
Moral Hazard
When someone takes more risk because they know they will not bear the full consequences of a bad outcome. Bank bailouts can create moral hazard by signaling that large institutions will be rescued from the consequences of reckless lending, encouraging them to take excessive risks in the future.
Mortgage Points (Buydown)
Discount points (a rate buydown) are an optional upfront fee paid at mortgage closing to permanently lower the loan's interest rate. The rough market convention is 1 point = 1% of the loan amount, paid upfront, in exchange for about a 0.25% rate reduction. Whether points are worth it depends on the break-even: upfront cost divided by annual payment savings gives the number of years you must keep the loan to come out ahead. A long hold favors buying points; selling or refinancing sooner favors keeping the cash.
Mortgage-Backed Security (MBS)
A bond backed by a pool of home mortgages where investors receive monthly payments of principal and interest as homeowners make their mortgage payments. Prepayment risk is the key concern — when homeowners refinance early, investors receive their principal back sooner than expected at a time when rates are lower.
Mosaic Theory
The principle that assembling many public and non-confidential pieces — filings, lawful data, non-confidential expert color — into a sharper conclusion is legitimate research, even though it produces a real informational edge. It is the lawful counterpart to insider trading: an edge becomes illegal only when a decisive piece is material, nonpublic, and reached you through someone breaching a duty of confidentiality. Out-thinking lazier analysts with public information is the system working as intended.
Mr. Market
Benjamin Graham's allegory for market psychology: imagine a business partner who shows up daily offering to buy your shares or sell you his, at prices driven by his mood — euphoric on good days, depressed on bad ones. The lesson: Mr. Market is your servant, not your guide. When he's panicking, you can buy cheaply; when he's manic, you can sell dearly.
MSCI ACWI
MSCI All Country World Index — a benchmark covering large- and mid-cap stocks across 23 developed and 24 emerging market countries, representing roughly 85% of investable global market capitalization. Commonly used as the baseline for measuring home bias and global portfolio construction. As of 2023, US stocks represent approximately 60% of MSCI ACWI.
Multi-Stage DCF
A DCF model with two or more explicit stages before the terminal period -- typically a near-term explicit forecast (5 years) followed by a fade period (10-20 years) where ROIC and growth decay toward structural levels, then a terminal value. Multi-stage models are the practitioner default for businesses with abnormal returns because they avoid the over-precision of holding one set of operating assumptions flat across the full explicit horizon.
Multiple Expansion
When a company's exit valuation multiple (EV/EBITDA, P/E) is higher than its entry multiple, contributing positively to investor return. In LBO analysis, one of three return drivers (alongside EBITDA growth and debt paydown). Sometimes underwritten ("we'll improve the business so it merits a higher multiple"); often a market-timing tailwind. Reverse case ("multiple compression") happens when sponsors enter near a sector peak.
Multiples
Valuation ratios that compare price to a fundamental: P/E, EV/EBITDA, P/B, P/S. They tell you what the market is currently paying for businesses like the target, anchoring valuation to peer prices rather than to projected cash flows. Use them to sanity-check a DCF or screen for outliers; do not treat them as a verdict because they import every assumption baked into the peer set.
Multiplier Effect
How an initial injection of spending creates additional economic activity as the money circulates through the economy. A one-dollar increase in government spending can generate more than one dollar of total GDP impact as the recipients spend their incomes, which then become incomes for others.
Municipal Bond
A bond issued by a state, city, county, or other local government entity, or by an authority on its behalf. Interest is exempt from federal income tax (and often from state income tax for in-state residents), which is the structural reason munis exist. General-obligation munis are backed by the issuer's taxing power; revenue munis are backed by a specific project's revenue. Munis make the most sense in a taxable account at a high marginal tax rate; in tax-advantaged accounts the federal exemption is wasted.
Mutually Exclusive Projects
A capital-budgeting situation where choosing one project precludes the others — you can build a factory in Mexico OR Vietnam, not both. For mutually exclusive projects of different scales or timing patterns, NPV gives the correct ranking and IRR can mislead: a small project with a high IRR may have lower NPV than a large project with a moderate IRR. Pick by NPV.

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