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D Question 15 The diagram below gives information about demand and supply for corn in Econland P1o S OH NWA UQ NOD D 0 1 2 3 4 5 6 7 8 9 10 Suppose that a per-unit subsidy of $4 is imposed in this market. The total surplus of the corn market, after the subsidy, is equal toD Question 16 The diagram below gives information about demand and supply for cars in Econland. 14 13 S O-NWAMONODON D 0 1 2 3 4 5 6 7 8 9 10 Suppose that each car in Econland creates a $6 negative externality because of pollution. What is the total amount of external cost in the free market equilibrium