If the internal rate of return on an investment project is above the market rate of
interest, how would a profit maximising investor react?
a. Increase the capital labour ratio, until the marginal product of capital equals
the market rate of interest.
b. Reduce the capital labour ratio, until the marginal product of capital equals the
market rate of interest.
c. Leave the capital labour ratio unchanged so as to force the market rate of
interest to match the investment project’s internal rate of return.
d. Add to the existing capital stock until the capital labour ratio has risen to a
level where the marginal product of capital equals the market rate of interest.
答案是B 为什么呢？谁来帮我分析一下