Minecraft wiki entry for Building_a_metropolis, associated text: Anarcho-capitalism
There is no government; rather, corporations make all decisions, and enforce them with privately funded police forces.
Taxes are not necessary as no government exists and any typically public development is undertaken by private corporations based on demand and supply.
Any businesses or trades between players not authorized by the corporation is considered the black market.
It is recommended to put a highly secured wall around the city to prevent people from leaving the city to trade in order to avoid getting arrested.
The corporation is able to make prices as low or high as they want since they have an absolute monopoly.
Warning: Prices that are too high may cause riots unless you pay people lots of money as well.