Use the IS-LM-PC model to illustrate how the economy adjusts to an increase in taxes both in the short run and in the medium run.
In the IS Lm model, and increase in taxes will mean that the disposable income for consumers will fall and so this will cause a fall in consumption. Also a tax increase will cause a fall in investment as firms find it tougher to invest. The fall in consumption and investment will cause the IS curve to shift leftwards and this causes a fall in interest rates and the output level. Correspondingly, the aggregate demand curve will shift leftwards and will cause a fall in the prices and the quantity in the short run. Over time the economy adjusts itself back to the old output level but at a higher price level. The economy finally settles at A.
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