But that's sort of my point. If tbhere is no, or only a nominal, entrance fee and instead everyone is paying 10% tax on everything they sell, what is the point of the tax? It doesn't encourage or discourage behaviour, and will at most raise prices by 10% across the board. And since there is no NPC owner of the market place who needs the money, the money raised just disappears. So there may as well be *no* sales tax.

Unless the point is simply to have a cash sink to minimize mudflation. Or if the money raised by the tax was used somehow to improve the market place. That would be cool.