Question 3 . Consider the following extension to the benchmark real business cycle (RBC) model. The social planner solves the problem of the representative agent (household) to maximize its expected lifetime utility function given by: [(C)'-y – 1 (H,)!+"' 1+7 Eo Bt (4) 1-7 t-0 subject to the aggregate resource constraint, Eq. (5), the production function, Eq. (6), and the capital accumulation equation, Eq. (7): C + I = Y; (5) Y = Z,K-,H}¬a 1-a (6) K = (1 – 8)K1-1+4 . (7) B is the discount factor. Utility depends positively on the consumption of goods C, and negatively on the supply of labour hours H. y captures the inverse of the intertemporal elasticity of substitution in consumption. 7 measures the inverse of the Frisch elasticity of labour supply. Y; is output, I, is investment, and K, is physical capital. a measures capital's share in output, and o is the depreciation rate of capital. (a) Write down the combined budget constraint. (b) Write down the Bellman equation for the household's optimization problem, clearly indicating state variables and control variables. (c) Derive the first order conditions for the control variables.

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Question 3
Consider the following extension to the benchmark real business cycle (RBC) model. The
social planner solves the problem of the representative agent (household) to maximize its
expected lifetime utility function given by:
(C:)'- – 1
(H.)'+n¯
Eo
(4)
1-7
1+7
t0
subject to the aggregate resource constraint, Eq. (5), the production function, Eq. (6), and
the capital accumulation equation, Eq. (7):
C: + I = Y;
(5)
= Z,K ,H}-*
1-a
(6)
Kį = (1 – 8)Kt-1+I .
(7)
ß is the discount factor. Utility depends positively on the consumption of goods C1, and
negatively on the supply of labour hours H. y captures the inverse of the intertemporal
elasticity of substitution in consumption. 7 measures the inverse of the Frisch elasticity of
3
labour supply. Y; is output, I, is investment, and K is physical capital. a measures capital's
share in output, and d is the depreciation rate of capital.
(a) Write down the combined budget constraint.
(b) Write down the Bellman equation for the household's optimization problem, clearly
indicating state variables and control variables.
(c) Derive the first order conditions for the control variables.
Transcribed Image Text:Question 3 Consider the following extension to the benchmark real business cycle (RBC) model. The social planner solves the problem of the representative agent (household) to maximize its expected lifetime utility function given by: (C:)'- – 1 (H.)'+n¯ Eo (4) 1-7 1+7 t0 subject to the aggregate resource constraint, Eq. (5), the production function, Eq. (6), and the capital accumulation equation, Eq. (7): C: + I = Y; (5) = Z,K ,H}-* 1-a (6) Kį = (1 – 8)Kt-1+I . (7) ß is the discount factor. Utility depends positively on the consumption of goods C1, and negatively on the supply of labour hours H. y captures the inverse of the intertemporal elasticity of substitution in consumption. 7 measures the inverse of the Frisch elasticity of 3 labour supply. Y; is output, I, is investment, and K is physical capital. a measures capital's share in output, and d is the depreciation rate of capital. (a) Write down the combined budget constraint. (b) Write down the Bellman equation for the household's optimization problem, clearly indicating state variables and control variables. (c) Derive the first order conditions for the control variables.
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