Capitalism works just fine in a steady state economy because things break down. Buildings need to be repaired, styles change etc. Just look look at the plumbing industry it can grow or shrink but when your sink is broken and you don't know how to fix it you call someone.
Unless you're suggesting some form of utopia where people don't need to eat and nothing ever breaks. But even then someone is going to setup an MMO and the cycle of pretend money can start all over again.
Unless you're suggesting some form of utopia where people don't need to eat and nothing ever breaks. But even then someone is going to setup an MMO and the cycle of pretend money can start all over again.