You might explain the demand shock term as follows: When epsilon is zero, as it is on average, demand is determined by its “fundamentals,” the real interest rate and the natural rate of output. When epsilon > 0, demand is higher than the level implied by its fundamentals. This would occur, for example,
if consumers or businesses were unusually optimistic. When epsilon < 0, demand is lower than implied by the fundamental determinants of demand. This might represent pessimistic consumers or business firms.
(Caution: the preceding use of the term “fundamentals” is not in the textbook.)
Alpha is a positive parameter that reflects the sensitivity of aggregate demand to changes in the interest rate. A given change in the real interest rate has a bigger effect on output if alpha is large than if it is small.
Rho can be thought of as the “natural rate of interest,” the interest rate that, in absence of demand shocks, would prevail when output equals its natural level. To keep the model from becoming too complicated, we take rho to be an exogenous constant term.
You might explain the demand shock term as follows: When epsilon is zero, as it is on average, demand is determined by its “fundamentals,” the real interest rate and the natural rate of output. When epsilon > 0, demand is higher than the level implied by its fundamentals. This would occur, for example,
if consumers or businesses were unusually optimistic. When epsilon < 0, demand is lower than implied by the fundamental determinants of demand. This might represent pessimistic consumers or business firms.
(Caution: the preceding use of the term “fundamentals” is not in the textbook.)
Alpha is a positive parameter that reflects the sensitivity of aggregate demand to changes in the interest rate. A given change in the real interest rate has a bigger effect on output if alpha is large than if it is small.
Rho can be thought of as the “natural rate of interest,” the interest rate that, in absence of demand shocks, would prevail when output equals its natural level. To keep the model from becoming too complicated, we take rho to be an exogenous constant term.
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