# Macro econ | Economics homework help

Christina Romer and Jared Bernstein in “The Job Impact of the American Recovery and Reinvestment Plan” calibrated the impact of the proposed expansionary fiscal policy (we know it as an increase in G and/or a lower T) on jobs and GDP growth (Click Here for paper). In order to do so, they make assumptions about the size of Government spending and tax multipliers. One important assumption is contained in the paragraph below about the level of the federal funds rate:

” For the output effects of the recovery package, we started by averaging the multipliers for increases in government spending and tax cuts from a leading private forecasting firm and the Federal

Reserve’s FRB/US model. The two sets of multipliers are similar and are broadly in line with other estimates. **We considered multipliers for the case where the federal funds rate remains constant, rather than the usual case where the Federal Reserve raises the funds rate in response to fiscal expansion, on the grounds that the funds rate is likely to be at or near its lower bound of zero for the foreseeable future.**“

So in this question, we are going to employ some of the tools that we have acquired throughout the semester to understand how this assumption, “that the funds rate is likely to be at or near its lower bound of zero for the foreseeable future,” effects the government spending and tax multipliers.

2. a) ( 40 points total: 20 points for correct and completely labeled graphs and 20 points for discussion) In this question, we are going to compare the size of the Government spending multiplier under two different assumptions: i) the Fed sits on their hands so that when G rises, r rises with it (the standard case), and ii) the Fed accommodates the (real) shock to money demand so that real interest rates remain constant.

In the space below, draw 4 diagrams (label them 1 through 4) with 1) a closed economy desired saving; desired investment diagram, followed by 2) an IS – LM diagram followed by 3) a money market diagram followed by 4) an aggregate supply ; aggregate demand diagram.

We begin at our initial point A which is at an output well below potential GDP (i.e., there is a significant ‘output’ gap). We let G rise and with the assumption that the Fed sits on their hands (assumption i) above) we move to point B, which corresponds to an output closer to potential GDP, but still not quite there. We then assume assumption ii) above so that the Fed accommodates the real shock to money demand to keep rates constant. This assumption takes us to point C, which is at potential GDP (i.e., the output gap is gone!).

Start at an **initial equilibrium** and label as point A in all diagrams, with all the associated market clearing variables denoted by subscript A. For example, in your IS – LM diagram, the interest rate that clears the goods and money market is labeled as r_{A} with the associated output at Y_{A}. Note importantly that we are **assuming fixed prices** throughout this exercise. Now let G rise to G’ and show how all your graphs are affected. In particular, locate point B in all graphs **making sure you refer to each graph separately explaining the intuition of the movement from point A to point B. **

2. b) (20 points for explanation) We now apply assumption ii), the one Romer and Bernstein use “that the funds rate is likely to be at or near its lower bound of zero for the foreseeable future.” In terms of our analysis, the Fed is going to make sure that real rates remain at their initial level (i.e., they totally accommodate the real shock to money demand) Show this accommodation as point C on all of your diagrams. Recall that we are at full employment/potential GDP at point(s) C. Again, **make sure you refer to each graph separately explaining the intuition of the movement from point B to point C. **

2.c) (20 points) Now compare the government spending multiplier under assumption i) no Fed accommodation and ii) the Fed accommodates the real shock to money demand. Be specific with regard to the multiplier as well as the intuition. To support your intuition, draw two diagrams: the user cost = MPK^{f} and the two period consumption model clearly locating points A, B, and C. Referring to your 2 graphs, explain the intuition as to why we move from point A to point B as well as why we move from points B to C. Be sure to label your graphs completely or points will be taken off. Make sure you relate your discussion of your two graphs to the difference in the multiplier depending on what the Fed does or doesn’t do.

2.d) (25 POINTS) The real business cycle economists (RBC theory) came up with a story that explains exactly why money is a leading and pro-cyclical variable. In the space below, draw a money market diagram on the left, an IS/LM diagram on the right (label completely) and an aggregate demand / aggregate supply diagram below the IS/LM diagram. Discuss how the real business cycle economists (RBC) addressed this empirical reality (explain using your diagrams). Starting at the initial equilibrium, point A, let the shock that the RBC theorists use to explain this money – output correlation occur and assuming the **Fed does not react**, locate the new equilibrium as point B (assume prices are fixed in the short-run). Now discuss what would happen in the long-run commenting (again, the Fed does nothing) on the desirability of this long-run adjustment. Now consider the case where the Fed does their job so that these undesirable results do not occur and label as points C. Is money leading and pro-cyclical given the Fed’s behavior? Why is this model referred to as reverse causation? Is money neutral or not? Explain. Finish your essay explaining how** RBC economists explain the business cycle** (recurrent fluctuations in output) as well as their thoughts on **whether or not policymakers should conduct active counter-cyclical policy.**

e) (25 POINTS) The New-Keynesians came up with their own story as to why we observe this positive money – output correlation. **Begin with discussing why the New Keynesians believe that prices are sticky in as much detail as possible. **Then use the efficiency wage theory/model to buttress (support) your argument (i.e., why does the efficiency wage theory play a critical role in explaining why firms are willing to produce more output at the same price?). Draw two graphs, one showing the effort curve and the efficiency wage (be sure to explain how firms pick the efficiency wage) and the other being a labor supply labor demand diagram with the assumption that the efficiency wage (w*) is above the market clearing (classical) wage (w_{class}). Why is this model so attractive in dealing with the empirical reality in labor markets that the classical school has such a hard time with? Now draw another diagram depicting what is happening in the product markets (demand, marginal revenue, marginal cost and a profit function) and **why firms are willing to change output at the given price level **(short run) given the change in the money stock. Be clear as to why exactly firms are willing to act like a ‘vending machine’ in the short run (increase output at the same price). Is this firm behavior, being willing to increase output at the same price, consistent with the firm’s profit maximizing objective? Why or why not?

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