Question

Suppose output is given by Y = K 1/2 (AN) 1/2 As in the basic model,...

Suppose output is given by

Y = K 1/2 (AN) 1/2

As in the basic model, the workforce grows at rate n, capital depreciates at rate d and the savings rate is s. In addition, suppose that TFP grows at a constant rate g. That is:

∆A/A = g

We will refer to the product AN as the “effective workforce”. It follows that the effective workforce grows at rate n + g.

a. Express the production in per “effective worker” terms by letting ye = Y/AN and ke = K/AN .

b. The growth in capital per effective worker can be written as

∆ke / ke = ∆K/K − ∆A/A − ∆N/N

Using the same steps as described in class, derive the dynamics of capital per effective worker.

c. Illustrate the steady-state for this economy on a diagram and derive an expression for the steady-state capital stock per effective worker, ke . How does it depend on g?

d. Derive an expression for the steady-state output per effective worker, y e . In this steady-state, at what rate must output per worker, y = Y/N , be growing?

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