7. An important insight by early economists was that an economy based on free-market transactions is -organizing. Adam Smith developed the idea that , not benevolence, is the foundation of economic order. 8. Self-interested buyers and sellers respond to 9. The three types of decision makers in any economy are and 10. Consumers are assumed to make decisions that will their utility. Producers are assumed to make decisions that will their profit. 11. Consumers and producers are assumed to weigh the costs and benefits of their decisions at the . For example, for a consumer, the benefit of buying "one more" unit of a good must outweigh the of buying that unit