Question

30) In a competitive market the market demand curve measures the if exist. In a competitive market, the market supply curve measures the _exist. A) marginal social benefit; no external costs; marginal social cost; no external benefits B) firms' marginal benefit; external benefits; consumers' marginal cost; external costs C) marginal social benefits external benefits; marginal social cost; external costs D) consumer surplus; external benefits, producer surplus; external costs E) marginal social benefit; no external benefits; marginal social cost no external costs