Question

The law of supply and demand is foundational to what economy

Answer 1

An economy like the one America has... sorry im not sure what its called.. but basically, if there are less supplies, and more people wants it.. thats how supply and demand starts.

I think it is market economy

Answer 2

The best answer is laissez-faire. 

The process of supply and demand is essential to the economic system of laissez-faire which is founded upon an absence of regulations or interference of anything outside of the natural economic interaction. Communism is incorrect because the economic markets are controlled by the government, and socialism is also incorrect because its economic markets are determined by participation, not value.