Ans. Option b
Marginal Product of input i = MPi
Price of output produced = P
Price paid to input i = Pi
=> Value of marginal product of i = VMPLi
Value of marginal product of an input is the value of the
additional output produced by an incremental input and the price
paid to the additional input is the marginal cost for each
additional output. So, the profit maximizing level would be where
revenue from additional input equals the cost of input.
So,
VMPLi = Pi
=> VMPi/ Pi = 1
Thus, for each unit,
VMPa/Pa = VMPb/Pb = VMPc/Pc = .....= 1
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