Money is useful only in an environment of scarcity - be it natural (as in ancient times), or artificial (as is the case today). It can be used to manage and allocate resources, or control populations.
But what happens when this breaks down? What happens when technology provides individuals with the means to produce any practical item they may need in their lifetime? Food, medicine, shelter, entertainment - all provided for through nanotechnology.
It is a question I have been pondering for many years, and i would like to hear some intelligent opinion on it from others here.
Here is a short video from Michio Kaku (prominent physicist) that explains the question well.
Michio Kaku: Can Nanotechnology Create Utopia? - YouTube
What happens to society when working for a living is as irrelevant as going to church?