market economy is Question 8 options: a formal system where the laws of supply and demand set the exchange rates for food or other goods an informal system where people must barter directly with the producer, such as exchanging six chickens for one cow a formal system of special-purpose money, such as exchanging a set number of bottlecaps, which represent access to water resources, for a set amount of food an informal system where people use redistribution to exchange goods and services over many months