Which of the following is NOT an example of common property?

According to the Ricardo-Barro effect, if the government runs a budget deficit of $100 billion, by how much does the amount of equilibrium investment increase or decrease?

What will be an ideal response?

Monopolistically competitive firms

a. are guaranteed to earn short-run economic profit b. may earn short-run economic profits, although long-run economic profit is typically zero c. may earn economic profit both in the short run and in the long run d. earn zero economic profit both in the short run and in the long run e. can only earn an economic profit in the inelastic portion of their demand curves