刚开始学宏观 不太明白 求大神帮忙

1.In the context of the money market equilibrium explain the short run effects of a decrease of money supply on the price of bonds. What should happen in the long run instead? Use a diagram to support your answer.

2.Suppose the economy is populated by two groups of people, the rich group and the poor group. The two groups are equal in size. There is evidence that the poor group has a higher propensity to consume than the rich group. In the context of the goods market equilibrium explain the overall effect on output of an increase in taxes on the rich group and a decrease in taxes on the poor such that total tax revenues stay constant. Use a diagram to support your answer. In your view, is the policy proposed a “good” policy? Explain.

3.Suppose that the government decreases government expenditure.  However the central bank wants to keep fixed the level of output in the economy. In the context of the IS-LM model explain what the central bank should do in order to achieve its objective. Use a diagram to illustrate your answer.