A world without money.

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Problem is, we just don't have the resources right now to give people whatever they want. So we need a system like money to prevent every resource from being either (a) completely first-come-first-serve, or (b) doled out equally to everyone by the government. Money is also an incentive, to get people to do work, or help someone out, or whatever.

In the far future, we might have enough resources to give everyone what they want (maybe we have some kind of matter replicator, and enough energy is being produced to easily power everything, including that). I imagine we'd also need a pretty strong legal presence to make sure enough work gets done to keep the society running, and to make sure people don't just spend all day being mean to each other. In that case we could do away with money entirely, if we wanted.