a) Determine the cyclical behaviour of the key macroeconomic variables of the model! b) How do the political business cycles depend on the assumption about the expect- ations of the electorate? What role plays the parameter a in the duration of the cycles?

ENGR.ECONOMIC ANALYSIS
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Chapter1: Making Economics Decisions
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Consider a society which consists of identical voters interested in having low unem-
ployment rate U, and low divergence of inflation from a given target rate (for simpli-
city assumed to equal zero). Voters' dissatisfaction in any period t can be represented
by the following loss function:
0
L₁ = U₁ + — (Mt+1 − ñ)²,
where is the relative weight the voters put on the inflation deviations relative to
unemployment. The only objective of the policy-maker is to maximize the probability
of his re-election. We assume that the voting is retrospective so that the policy-maker
maximizes the number of votes in the election at the end of period t which is a function
of voters' well-being over an exogenously given length of time of 4 periods between
elections:
[]+
B²L₁-s +6,
N₁ = N
where N'(-) < 0 holds, 0 <ß < 1 is the discount factor and e is a zero-mean random
term. The structure of the economy is summarized by a Phillips curve:
U₁ = -(μ₁ −μ₂²),
e
where μ, is the money growth rate and μ, denotes the private expectations of this rate.
Voters have adaptive expectations so that the expected money growth is a weighted
average of the observed money growth in the past two periods:
μ₁² = (1-α)μ₁-1 + aμ₁-2²
We assume that the money growth affects the inflation with a lag of one period:
πt = Mt-1.
a) Determine the cyclical behaviour of the key macroeconomic variables of the model!
b) How do the political business cycles depend on the assumption about the expect-
ations of the electorate? What role plays the parameter a in the duration of the
cycles?
Transcribed Image Text:Consider a society which consists of identical voters interested in having low unem- ployment rate U, and low divergence of inflation from a given target rate (for simpli- city assumed to equal zero). Voters' dissatisfaction in any period t can be represented by the following loss function: 0 L₁ = U₁ + — (Mt+1 − ñ)², where is the relative weight the voters put on the inflation deviations relative to unemployment. The only objective of the policy-maker is to maximize the probability of his re-election. We assume that the voting is retrospective so that the policy-maker maximizes the number of votes in the election at the end of period t which is a function of voters' well-being over an exogenously given length of time of 4 periods between elections: []+ B²L₁-s +6, N₁ = N where N'(-) < 0 holds, 0 <ß < 1 is the discount factor and e is a zero-mean random term. The structure of the economy is summarized by a Phillips curve: U₁ = -(μ₁ −μ₂²), e where μ, is the money growth rate and μ, denotes the private expectations of this rate. Voters have adaptive expectations so that the expected money growth is a weighted average of the observed money growth in the past two periods: μ₁² = (1-α)μ₁-1 + aμ₁-2² We assume that the money growth affects the inflation with a lag of one period: πt = Mt-1. a) Determine the cyclical behaviour of the key macroeconomic variables of the model! b) How do the political business cycles depend on the assumption about the expect- ations of the electorate? What role plays the parameter a in the duration of the cycles?
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