is an economic system based on free markets, in which all or most of the factors of production and stribution are privately owned and operated for profit.

a$.$ Capitalism

b$.$ Socialism

c$.$ Mixed economy

d$.$ Communism

e$.$ Command economy

The "invisible hand" refers to:

a$.$ a description of the benefits of a communist economy.

b$.$ a description of the benefits of a command economy.

c$.$ a description of the benefits of a mixed economy.

d$.$ a description of individual personal gains benefiting others.