Endowment Effect

02What People Think

"I know what this is worth. It is mine, and I am not giving it away."

03What’s Underneath

Imagine two identical secondhand chairs. You dismiss one listed for $50, then ask $80 for yours. Nothing about the wood or condition explains the difference. Ownership may have changed the question: buying means giving up money to gain a chair; selling means giving up a chair you already count as part of your life.

One explanation is loss aversion: surrendering something can feel more important than acquiring the same thing. Attachment, expectations and the details of the transaction also matter. Research does not show an identical ownership premium in every setting, and experienced trading can look different from a first, unfamiliar sale.

A family photograph can genuinely mean more to its owner than to a stranger. Replacement hassle and knowledge of an item can also justify different prices. The useful distinction is whether you can identify those benefits, or whether "mine" is doing most of the valuing. Buyers cannot be expected to pay for memories they do not receive.

04The Game

If you did not own this today, would you buy it at the price you are refusing? The answer does not force you to sell, but it makes the cost of keeping it clearer.