“A wine-loving economist we know purchased some nice Bordeaux wines years ago at low prices. The wines have greatly appreciated in value, so that a bottle that cost only $10 when purchased would now fetch $200 at auction. This economist now drinks some of this wine occasionally, but would neither be willing to sell the wine at the auction price nor buy an additional bottle at that price.”1
The story above is an example of endowment effect: someone who owns a good will value it more than someone who does not. Behavioural economist Richard Thaler coined the term in 1980, having noticed many anecdotal anomalies such as the one above in his everyday life. Together with Daniel Kahneman and Jack Knetsch, he later demonstrated how widespread the phenomenon was in research such as the well-known study asking students to buy and sell Cornell University mugs.