Which of the following are market structures that are characterized by at least some competition between producers? Check all that apply

A. Monopoly

B. Socialist planning

C. Oligopoly

D. Pure competition

E. Monopolistic competition

The answer is: "C", "D", and "E".

Oligopoly: This is a state of limited competition where a small number of producers or sellers share the market.

Pure competition: This refers to a wide range of market where competitors are selling the same product.

Monopolistic competition: As the name suggests in this case some producers or elements have some control over the prices of the market.