A primary criticism with the comparative advantage argument as justification for the existence of swaps is related to which of the following?
　　A. Perceived advantage in one market over the other.
　　B. Constant spreads over London Interbank Offered Rate (LIBOR).
　　C. Credit risk.
　　D. Inefficient credit markets.
　　Answer:C
　　Credit risk is the main criticism of the comparative advantage argument, which fails to take into account the fact that a swap participant faces credit risk.