In the late 1980s, ________ domestic private investment led to ________ in net foreign borrowing

What makes a model compelling?

a. its predictions b. its mathematical structure c. its assumptions d. its simplicity

A customer at an auction who obtains an antique chair by outbidding several other prospective purchasers

A) may be paying more than the opportunity cost of obtaining the chair. B) pays a price other than opportunity cost. C) pays more than its real cost of his bid exceeds the original cost of the chair plus the cost of running the auction. D) pays the opportunity cost of the last disappointed bidder.