Which of the following statements explains the concept of the tragedy of the commons? (check all that apply.)a. it occurs due to excludability and non-rivalry. b. it is an example of a positive externality. c. the open access to common resources results in their depletion through overuse. d. it results when the free market equilibrium quantity is higher than the optimal equilibrium quantity.

Because this market is a monopolistically competitive market, you can tell that it is in long-run equilibrium by the fact thatmr=mc at the optimal quantity for each firm. furthermore, a monopolistically competitive firm's average total cost in long-run equilibrium isless than the minimum average total cost. true or false: this indicates that there is a markup on marginal cost in the market for engines. true false monopolistic competition may also be socially inefficient because there are too many or too few firms in the market. the presence of the externality implies that there is too little entry of new firms in the market.