Second Welfare Theorems There are two goods A and B and two inputs K and L. The production functions are AK L-a BK{L;- Ya %3D 1-3 %3D

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3. First and Second Welfare Theorems
There are two goods A and B and two inputs K and L. The production functions are
Ya
AK,L
1-8
The production functions display the standard properties, including constant returns
to scale.
A representative household has utility
U(Ca, Ch)
where
is the consumption of good i. The total supply of each factor is fixed
Ci
K
Ka + K,
La + L,
Transcribed Image Text:3. First and Second Welfare Theorems There are two goods A and B and two inputs K and L. The production functions are Ya AK,L 1-8 The production functions display the standard properties, including constant returns to scale. A representative household has utility U(Ca, Ch) where is the consumption of good i. The total supply of each factor is fixed Ci K Ka + K, La + L,
(b) Now assume a market system.
i. Households own the labor and capital, which is rented to firms. The household
faces a budget constraint
waLa + wLb +raKa+ r¿K½ > PaCa + PhCb
where wi is the real wage paid in industry i and r; is the rental rate in
industry i. The total supply of each factor is fixed, as described above. Solve
the household's maximization problem.
ii. Firms maximize profits. A firm's profits in industry A are
Ta = PaFa(Ka, La) – waLa – raKa
and a firm's profits in industry B are
Tb = P3F6(Kb, Ls) – w„Ln – r¿K,
Solve the maximization problem for each firm.
iii. State the equilibrium conditions assuming households and firms are price-
takers.
(c) Demonstrate how the two allocations - the solution to the social planning problem
and the competitive equilibrium - are equivalent. Provide a statement of the First
and Second Welfare theorems using this example.
Transcribed Image Text:(b) Now assume a market system. i. Households own the labor and capital, which is rented to firms. The household faces a budget constraint waLa + wLb +raKa+ r¿K½ > PaCa + PhCb where wi is the real wage paid in industry i and r; is the rental rate in industry i. The total supply of each factor is fixed, as described above. Solve the household's maximization problem. ii. Firms maximize profits. A firm's profits in industry A are Ta = PaFa(Ka, La) – waLa – raKa and a firm's profits in industry B are Tb = P3F6(Kb, Ls) – w„Ln – r¿K, Solve the maximization problem for each firm. iii. State the equilibrium conditions assuming households and firms are price- takers. (c) Demonstrate how the two allocations - the solution to the social planning problem and the competitive equilibrium - are equivalent. Provide a statement of the First and Second Welfare theorems using this example.
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