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Question 4 (12 points). Use the ISLM model to graphically analyze the following cases. Suppose two identical countries, Alpha and Beta, can be described by the JSLM model in the short not. The governments of both countries increase spending by the same amount. The Central Bank of Alpha follows a policy of holding a constant money supply. The Central Bank of' Beta follows a policy of holding a constant intermt rate. Use the IS LM model to illustrate graphically and explain the policy impact of the expenditure increase on income and interest rates in the two countries