Common anchors and better approaches
| Anchor | Why It’s Dangerous | Better Approach |
|---|---|---|
| Your purchase price | Irrelevant to future returns — the stock doesn’t know what you paid | Evaluate based on current valuation vs. intrinsic value |
| 52-week high | Past prices don’t determine future value | Compare current price to fundamental worth |
| Analyst price target | Often anchored to current price themselves | Build your own model with independent assumptions |
| IPO price | An arbitrary starting point set by bankers | Value based on current financials and growth |
How random numbers can sway estimates
Studies show that even random numbers influence financial decisions. In Tversky and Kahneman's classic experiment, spinning a rigged wheel of fortune before asking people to estimate the percentage of African countries in the United Nations systematically biased their answers toward the random number.
Test whether your purchase price anchors you
Think of a stock you own. Is your decision to hold it influenced by what you paid? Would you buy it today at the current price if you didn’t already own it? If not, you’re anchored.
Spotting anchoring in a hold-to-breakeven trap
You bought a stock at $80. It’s now $60. You wouldn’t buy it at $60 today, but you’re holding ‘until it gets back to $80.’ What bias is this?
The would-I-buy-today question
Check your understanding
Sit with the ideas.
An analyst sets a $150 target on a stock at $120; another independently values it at $95. You read the $150 target first. How does anchoring most likely distort your subsequent valuation work?
Why:
Try this in paper trading
Dollar-cost average for four weeks
Pick one ETF or stock you'd hold for 10+ years. Paper-buy the same dollar amount of it once a week for four weeks — same day each week. Journal what you noticed about the rhythm of the discipline.
Open paper portfolio →Practice mode — simulated trades, not investment advice.