Obstacles to collusion among oligopolists include the following, except

A) demand and costs differences among firms.
B) long-lasting economic recession and poor industry performance.
C) potential new entrants into the market.
D) "gentlemen's agreements" among the firms.

Collusion

A non-competitive secret or illegal agreement between rivals that attempts to disrupt the market's equilibrium by influencing the market mechanism such as price or output of goods and services.

Economic Recession

A period of significant decline in total output, income, employment, and trade in an economy, usually lasting from six months to a year.

Gentlemen's Agreements

Informal, non-binding agreements based on trust, honor, and the integrity of the parties, without any written documentation.