a. Write out the differential equation for wealth. b. For an infinite time model, set up the optimal control problem with discounting at a rate 8. c. Write the current-valued Hamiltonian of this problem. d. Derive the steady-state level of consumption.

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter17: Capital And Time
Section: Chapter Questions
Problem 17.1P
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Consider the model where an individual has wealth k which they can either save or
consume. If they save it, they receive a fixed and exogenous return r. The
instantaneous utility function is given by:
u(c, k) = c + a(k)
where c is consumption, k is wealth, and a(k) is a function that defines the utility
that an individual gets from holding wealth.
The growth in wealth is given as the returns on wealth rk, plus income from
working z(t), minus consumption c(t).
a. Write out the differential equation for wealth.
b. For an infinite time model, set up the optimal control problem with discounting
at a rate 8.
c. Write the current-valued Hamiltonian of this problem.
d. Derive the steady-state level of consumption.
Transcribed Image Text:Consider the model where an individual has wealth k which they can either save or consume. If they save it, they receive a fixed and exogenous return r. The instantaneous utility function is given by: u(c, k) = c + a(k) where c is consumption, k is wealth, and a(k) is a function that defines the utility that an individual gets from holding wealth. The growth in wealth is given as the returns on wealth rk, plus income from working z(t), minus consumption c(t). a. Write out the differential equation for wealth. b. For an infinite time model, set up the optimal control problem with discounting at a rate 8. c. Write the current-valued Hamiltonian of this problem. d. Derive the steady-state level of consumption.
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