What is one of the main differences between a monopoly and an oligopoly? a. oligopolies face downward sloping demand curves, unlike monopolistic firms. b. an oligopoly is a market situation where there are no close substitutes for the good. c. firms in oligopoly can set prices to a degree but must consider other firms' decisions. d. there are barriers to entry for firms in a monopolistic but not in oligopolistic markets.

C. seems to be the closest to the correct answer.

C gets close to the analysis that collusion is common in oligopolies as collusion is (illegal) but easier than competition

A is incorrect as oligopoly has a kinked, not downward sloping curve.

Oligopoly is a market structure where there are limited options for producers, but there are options. So, B is incorrect.

There are barriers to entry in both monopolies and oligopolies so D is incorrect.

answer; i believe the correct answer is prefrontal cortex;

you would times this by how many days there are in a year 365*400=$146000