Question

Suppose that we have perfectly competitive input markets (for both capital and labour) and output markets....

Suppose that we have perfectly competitive input markets (for both capital and labour) and output markets. Firm Tomato Harvesting produces canned tomatoes which it sells at $50 (it is a big can of tomatoes!). Suppose that initally the firm’s production technology is given by: f(k,l)= √l

A technological innovation has occured however! A new tomato harvester has been invented by a professor at UC Davis. If the firm employs the tomato harvester, the new production technology is given by: f(k,l) = k^(0.25) √l The rental rate of capital is $2.
(a): Suppose the market wage is $3. How much more or less labour will the firm use once it switches to the new production technology with the tomato harvester in the long run?

Homework Answers

Answer #1

We see that initially the firm’s production technology is given by q = l^0.5. This implies that MPL is 0.5/l^0.5 and

Value of MPL is price x 0.5/l^0.5 which becomes 50*0.5/l^0.5 or 25/l^0.5. At the optimum level VMPL should be

equal to the wage rate so we have 25/l^0.5 = 3. This gives l* = (25/3)^2 = 69.44 units and output = 69.44^0.5 =

8.33

With new production function q = k^0.25 l^0.5, we have MRTS = MPL/MPK

= 0.5*(l^-0.5)*(k^0.25) / 0.25*(k^-0.75)*(l^0.5)

= 2k/l

Wage rental ratio is 3/2 or 1.5. At the optimal input mix firm has MRTS = wage rental ratio or 2k/l = 1.5 of k =

0.75l. To produce the same output we have 8.33 = (0.75l)^0.25 l^0.5 or l = 18.58

Hence the firm has reduced the use of labor from 69.44 units to 18.58 units

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