The idea that free markets should be left alone to boost economic activity is referred to as economics.
a. voodoo
c. la valise
b. laissez-faire
d. bourgeoisie

This is known as the "laissez-faire" -the phrase comes from French and means "let do" as in" them them do what they want" - this emphasisez economic freedom and the idea that the free markets should allow people do what they want.

Bourgeoisie is a social class and voodoo is a set of beliefs similar to religion.