21  Consider an economy where the demand for real money balances is interest elastic and the demand
for investment is interest inelastic. A change in the money supply will result in a relatively:


A small change in the rate of interest and the level of investment.
B large change in the rate of interest and the level of investment.
C small change in the rate of interest and a relatively large change in the level of investment.
D large change in the rate of interest and a relatively small change in the level of investment.


这是CT72015年4月的真题，标准答案是A。好像是Module18 Money and interest rates里的传播机制的内容。我不理解的地方是为什么real money balances is interest elastic， investment is interest inelastic，造成的改变都是很小的？求前辈指教！