Refer to the above diagrams for two separate product markets. Assume that society’s optimal level of output in each market is Q0 and that government purposely shifts the market supply curve from S to S1 in diagram (a) and from S to S2 in diagram (b). The shift of the supply curve from S to S1 in diagram (a) might be caused by a per unit:

ANSWER:

tax on the producers of this product.