当经营安全率低于( )时，企业就要做出提高经营安全率的决策。
A．50%
B．40%
C．30%
D．20%
参考答案：D
An increase in which one of the following monetary measures would best complement fiscal measures that are designed to stimulate aggregate demand during a period of high unemployment（）
A. Reserve requirements.
B. Treasury securities held by the Federal Reserve.
C. The Federal Reserve’s discount rate.
