Generally you imagine that future money decreases in value (in real terms). For example, you need to at least beat inflation-protected bonds! So in order to get

Generally you imagine that future money decreases in value (in real terms). For example, you need to at least beat inflation-protected bonds! So in order to get constant real terms over the life of a piece of art, the actual price to consume has to increase exponentially over time. But in fact we get the sense that most art drops in consumer value over time (how many times have you listened to Gangnam Style in the last month?) so exponentially increasing price would not bring linear return.