2 Sentiment shock:
In 2001, terrorists attacked the World Trade Center which made people very pessmistic about the future economy. Use IS-LM model to analyze how such a pessmistic sentiment affect the US economy. Also explain what should the US government to cancel the adverse effects caused by such pessmistic sentiment.
Pessimism about future economy will reduce both investment and savings, which will shift the IS curve leftward, lowering real interest rate and lowering output. This adverse effect on the economy can be countered by an increase in money supply which will shift LM curve rightward, which will decrease interest rate but increase output. To ensure output effectively rises, rightward shift of LM curve has to be higher in magnitude than leftward shift of IS curve.
In following graph, initial equilibrium is at point A where IS0 and LM0 intersect with initial interest rate r0 and initial output Y0. As IS0 shifts left to IS1 and LM0 shifts rightward to LM1, they intersect at point B with lower interest rate r1 and higher output Y1. Since rightward shift in LM is higher than the leftward shift in IS, output is higher.
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