Which of these firms has the least incentive to advertise?

Correct answer D. Since price is above marginal cost, some units that buyers value in excess of their cost of production are not produced, causing a deadweight loss

Correct answer C. There are many sellers in a monopolistically competitive market and there is free entry and exit, just like a competitive market

Correct answer B. The producer of a highly differentiated consumer product

Correct answer B. Advertising increases competition, which causes unnecessary bankruptcies and layoffs