In a perfectly competitive industry in the short run, if wages increase, which of the following will occur? A. Marginal costs will decrease, and industry supply will decrease. B. Marginal costs will increase, and industry supply will decrease. OC. Marginal costs will increase, and industry supply will increase. OD. Marginal costs will not change, but the industry supply will increase.Market failure occurs when A. all firms in the industry earn an economic profit of zero. B. market price is equal to marginal cost. OC. an unrestrained market allocates too many or too few resources to a specific economic activity. OD. markets do not produce goods desired by government planners