When a market failure due to underproduction exists, economic surplus can be measured as the area below the marginal benefit curve and above the: marginal cost curve, out to the actual quantity. marginal cost curve, out to the efficient quantity. equilibrium price, out to the efficient quantity. equilibrium price, out to the actual quantity.Which concept is most relevant to the question, "Which businesses should produce a lot, and which should produce only a little?" efficient production efficient allocation equity consumer surplus