In: Economics
Q=60L^2 K^1/2 - 4L^2
K(K bar)=9
After what quantity of labor does diminishing marginal returns now occur?
What is the maximum output the firm can now produce?
Solution:
We are given the production function as: Q = 60L^2 K^1/2 - 4L^2 ; where Q is output, K is capital and L is labor
With K as constant at 9, the function becomes: Q = 60*L^2*(9)^1/2 - 4L^2
Q = 180L^2 - 4L^2 = 176L^2
Marginal returns = dQ/dL = 2*176*L = 352*L
So, with increase in L, marginal return is increasing, and not diminishing here (unlike well behaved production function). With no diminishing, the maximum output can go till infinite.
PS: parameters of production function could be different than actual, resulting in not diminishing marginal returns, kindly recheck.