Jack has owned the same stock for over five vears, It has decreased in walue by $30\%$ since he bought it$,$ Even though finandal experts tell him to change his imestments to eaen back his losses, Jadk refuses to sel the pogrly$-$perferming stock. He fears that seling now would tum his peoer lass itto a real lass, even thouph holdng onto the stock might lead to further dedine, and changing lis investmemt might lead to tipaer gains. What psychobpical principle best explains fack's refuctance to sell his underperferming stock?

Decey option

Ancharing

Erdowmant effect

Loss aversian