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Panic selling is selling investments because prices are falling fast and fear takes over, not because anything about the investment has changed. It turns a temporary fall into a permanent loss and often means missing the recovery.
Behind it is loss aversion: Daniel Kahneman and Amos Tversky showed in 1979 that losses hurt more than equal gains feel good, and their later work put the pain of a loss at roughly twice the pleasure of the same gain. When prices tumble and everyone around you is selling, the urge to make the pain stop can win over any plan.
Selling after a fall locks in the loss, and the rebound often comes when it feels worst. On Black Monday, 19 October 1987, the Dow Jones Industrial Average fell 22.6% in a single day, yet within about two years it was back above its pre-crash peak. In 2020 the S&P 500 fell about a third in a month as the pandemic hit, then reached a new record high that August.
Recoveries aren't guaranteed and can take a long time: after 1929 the Dow needed 25 years to regain its peak. The usual protections are a plan made in calm times, an emergency fund so you never have to sell to pay bills, and investments you'd be willing to hold through a bad year. Studies of real brokerage accounts found that the households that traded most earned noticeably less than the market.
You own $1,000 of an index fund. It falls 30% to $700 in a month and you sell. Six months later the fund is back at $1,000. Selling turned a $300 loss on paper into a real one; holding would have left you even.
About once a week the city runs a crash drill: ten minutes of siren, red banner and panicky headlines while real prices don't move at all. Players who hold everything through it earn the Drill Diamond Hands badge; anyone who sells gets a short note on why panic selling hurts. →
Decide in calm times what would make you sell (the reason you bought no longer holds, or you need the money soon) and write it down. A falling price alone shouldn't be on the list.
Keep an emergency fund in savings, so a downturn never forces you to sell investments to pay a bill.
When markets panic, check the real numbers and wait a day before trading.
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The tendency to feel a loss more strongly than a gain of the same size. Kahneman and Tversky described it in their 1979 prospect theory, and later estimates put losses at about twice the weight of gains.
Yes, when your reason for owning something has changed or you need the money soon. The mistake is selling only because the price fell and other people are scared.
19 October 1987, when the Dow Jones Industrial Average fell 22.6% in one day, still its largest one-day percentage drop. Selling fed on itself as automated strategies and frightened investors sold at once.
It varies a lot: about six months after the 2020 crash, about two years after 1987, and 25 years after 1929. Past recoveries don't promise future ones.
Which term is this?
“____ measures how much and how quickly a price moves up and down, usually as the annualized standard deviation of its returns.”
Categories: Risk and strategy
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