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Endowment effect and overvaluing open positions

Once you own something, it can feel more valuable than it did a minute before. Behavioural economists call this the endowment effect, and it shows up in everything from coffee mugs to stock portfolios. For event contract readers, it can make an open position feel worth more than the market says. This SoftCta guide explains the effect and how to check your own valuations.

The classic finding

In well-known experiments by Daniel Kahneman, Jack Knetsch and Richard Thaler, participants who were given a mug asked for substantially more money to sell it than other participants were willing to pay to buy the same mug. The gap between willingness to accept and willingness to pay has been replicated in many settings, though its size varies and researchers debate the causes. Experience with trading, clear market prices and framing can reduce it.

Why it happens

A common explanation is loss aversion: giving something up feels like a loss, and losses weigh more than equivalent gains. Ownership may also shift attention to an item's good qualities. In markets, people who have researched and chosen a position may feel it reflects their judgment, which adds emotional weight.

How it shows up in event markets

• Holding at prices you would not pay: you own Yes at 40 cents, it now trades at 25, and you would not buy at 25, yet you keep holding because selling feels wrong.
• Ask prices above the market: resting sell orders far above where anyone is trading.
• Ignoring new information: discounting news that lowers the value of what you hold, a cousin of confirmation bias.

This overlaps with the sunk cost fallacy, where past spending drives present decisions, and with the status quo preference.

A fair-price test

A simple question cuts through the effect: if I did not own this position, would I buy it now at the current price? If the answer is no, then holding it is equivalent to making a purchase you would not make. Include fees and spread in that judgment, since closing a position costs something. Our mark-to-market guide explains how displayed values differ from settlement.

Habits that help

• Write an exit rule before you enter, as described in our premortem guide.
• Record your probability estimate separately from your position size.
• Review open positions on a fixed schedule rather than when prices move.
• Convert the current price with the implied probability tool and compare it with your updated estimate, not your entry price.

A reading habit

The endowment effect is normal, and recognising it is the first step. When you review a position, set aside your entry price and ask what the contract is worth now. Verify live prices on the venue and remember that event contracts involve substantial risk of loss.

Primary sources SoftCta readers open

• Kahneman, Knetsch and Thaler's experiments on the endowment effect
• Behavioural economics literature on willingness to accept versus willingness to pay
• Venue documentation on mark-to-market displays
• Your own trading journal

Reading the quote step by step

• Read the full title and rules, including the named settlement source and the time zone.
• Convert the Yes and No prices to implied probabilities and note the gap between them.
• Subtract fees and spread to see the effective price you would actually face.
• Write your own probability range and the evidence behind it, then compare.
• Check related and near-duplicate markets on other venues for consistency.

Closing SoftCta checklist

• Re-read the venue definition in your own words before reacting to a price.
• Convert prices with fee and spread awareness; verify live cents on the operator.
• Prefer primary settlement sources over secondary headlines and social summaries.
• Treat ChanceWire hubs, movers, and tools as orientation — not order entry.
• Confirm age, location, and product eligibility; SoftCta pages will not suggest location spoofing.
• If clarity is incomplete, watching is a complete SoftCta outcome — no pick-selling urgency required.

SoftCta habits

• Write your own probability range before checking the crowd price.
• Prefer dated primary sources over social summaries.
• Compare related markets when a single book looks extreme.
• Size curiosity with fees and depth in mind; substantial risk of loss.