Endowment Effect

“One of the most famous examples of the endowment effect in the literature is from a study by Daniel Kahneman, Jack Knetsch & Richard Thaler, in which participants were given a mug and then offered the chance to sell it or trade it for an equally valued alternative (pens). They found that the amount participants required as compensation for the mug once their ownership of the mug had been established (“willingness to accept”) was approximately twice as high as the amount they were willing to pay to acquire the mug (“willingness to pay”).” -Wikipedia