For a given good or service, the marginal social benefit ( MSB and the marginal social cost (MSC) curves are least accurately described by which of the following（）
A. Producer surplus is determined by price and the MSC curve and consumer surplus is determined by price and the MSB curve.
B. The efficient allocation of resources occurs where the difference between the MSB and MSC curves is maximized.
C. The market demand curve is the same as the MSB curve, and the market supply curve is the same as the MSC curve.
参考答案：B
解析：
The marginal social benefit (MSB) curve is the market demand curve and the marginal cost (MSC) curve and is the market supply curve. At the intersection of the MSB and MSC curves, the sum of producer and consumer surpluses is maximized and society’s resources are being efficiently allocated.
