= Consider the following 2 person, 1 good economy with two possible states of nature. There are two states of nature j = {1,2} and two individuals, i = {A, B}. In state- of-nature j 1 the individual i receives income y₁,1 whereas in state-of-nature j = 2, individual i receives income y₁,2. Let cij denote the amount of the consumption good enjoyed by individual i if the state-of-nature is j. State-of-nature j occurs with probability T₁ and ₁ + 2 = = 1. Prior to learning the state-of-nature, individuals have the ability to purchase (or sell) contracts that specify delivery of the consumption good in each state-of-nature. Let aj denote the number of consumption goods that individual i contracts to deliver in the event that state-of-nature j is realized. The relative price of contracts that specify delivery of goods in state-of-nature 2 is denoted by p. Individuals cannot create wealth by making promises to deliver goods in the future so the total net expenditure on purchasing contracts must equal zero, that is, aį,1 + paį,2 = 0. The individual's problem is {T₁u(C₁,1) + T₂u(C₁,2)} subject to the budget constraints C₁,1 = Yi,1 + ai,1, C₁,2 = Yi,2+ ai,2 and max Ci,1,Ci,2,ai,1,ai,2 + pai, 2 ai,1 = 0.

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter2: Mathematics For Microeconomics
Section: Chapter Questions
Problem 2.15P
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Define an equilibrium.

Consider the following 2 person, 1 good economy with two possible states of nature.
There are two states of nature j E {1,2} and two individuals, i E {A, B}. In state-
of-nature j
individual i receives income Yi,2. Let cij denote the amount of the consumption good
enjoyed by individual i if the state-of-nature is j. State-of-nature j occurs with probability
and T1 + T2 = 1.
1 the individual i receives income yi,1 whereas in state-of-nature j = 2,
Prior to learning the state-of-nature, individuals have the ability to purchase (or sell)
contracts that specify delivery of the consumption good in each state-of-nature. Let
denote the number of consumption goods that individual i contracts to deliver in
Ai,j
the event that state-of-nature j is realized. The relative price of contracts that specify
delivery of goods in state-of-nature 2 is denoted by p. Individuals cannot create wealth by
making promises to deliver goods in the future so the total net expenditure on purchasing
contracts must equal zero, that is, a¡,1 + pa;,2 = 0.
The individual's problem is
{T1u(ci,1) + T2u(ci,2)}
max
Ci,1,Ci,2,ai,1,ai,2
subject to the budget constraints ci,1
Yi,1 + ai,1, Ci,2 = Yi,2 + ai,2 and ai,1 + pai,2 = 0.
Transcribed Image Text:Consider the following 2 person, 1 good economy with two possible states of nature. There are two states of nature j E {1,2} and two individuals, i E {A, B}. In state- of-nature j individual i receives income Yi,2. Let cij denote the amount of the consumption good enjoyed by individual i if the state-of-nature is j. State-of-nature j occurs with probability and T1 + T2 = 1. 1 the individual i receives income yi,1 whereas in state-of-nature j = 2, Prior to learning the state-of-nature, individuals have the ability to purchase (or sell) contracts that specify delivery of the consumption good in each state-of-nature. Let denote the number of consumption goods that individual i contracts to deliver in Ai,j the event that state-of-nature j is realized. The relative price of contracts that specify delivery of goods in state-of-nature 2 is denoted by p. Individuals cannot create wealth by making promises to deliver goods in the future so the total net expenditure on purchasing contracts must equal zero, that is, a¡,1 + pa;,2 = 0. The individual's problem is {T1u(ci,1) + T2u(ci,2)} max Ci,1,Ci,2,ai,1,ai,2 subject to the budget constraints ci,1 Yi,1 + ai,1, Ci,2 = Yi,2 + ai,2 and ai,1 + pai,2 = 0.
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