What are the primary features of economic systems, and how are the sectors of the U.S. economy linked?

"Economics is the study of how individuals, businesses, and governments use scarce resources to produce and distribute goods and services. Today there is a global trend toward capitalism. Capitalism, also known as the private enterprise system, is based upon marketplace competition and private ownership of the factors of production. Competition leads to more diverse goods and services, keeps prices stable, and pushes businesses to become more efficient. In a communist economy, the government owns virtually all resources, and economic decision-making is done by central government planning. Governments have generally moved away from communism because it is inefficient and delivers a low standard of living. Socialism is another centralized economic system in which the basic industries are owned by the government or by the private sector under strong government control. Other industries may be privately owned. The state is also somewhat influential in determining the goals of business, the prices and selection of products, and the rights of workers. Most national economies today are a mix of socialism and capitalism. The two major areas in economics are macroeconomics, the study of the economy as a whole, and microeconomics, the study of households and firms. The individual, business, and government sectors of the economy are linked by a series of two-way flows. The government provides public goods and services to the other two sectors and receives income in the form of taxes. Changes in one flow affect the other sectors."