Suppose that Congress enacts a major tax increase. At the same time, the Federal Reserve uses monetary policy in such a way that the combined effect of the tax increase and the monetary policy is that GDP does not change at all. Based on this information, explain clearly what the overall (short-run) effect?

Since GDP does not change, it means that Federal Reserve System undertook expansionary monetary policy to counteract the contractionary fiscal policy.

a. Investment - Expansionary monetary policy means fall in interest rate, so investment would rise.

b. The net effect would be that AD curve would not have changed (since output is constant), so price level remains the same.

c. Government would get surplus as government spending is same but tax revenue rose.

answer; /// the above statement is (true);

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