One that comes to mind is a participatory budgeting game much like SimCity. The game let locals to actually do their own budgets based on local info. Some much economically can be optimized if all locals knows about how the money are spend.

Of course something like that would really take control out of hands of ones on top at the budget committees in DC and fees for their friends.

Decentralization will generate much much more wealth for most people, but it will take control away from a few that are in control.