# Chapter 25. Questions

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2 d. See the diagram below. A sharp decline in oil prices shifts the AS curve to the right; this increases output and causes the inflation rate to fall. However, if the Fed does not change its monetary policy rule, the expected inflation rate is still π 1, so the AS curve will shift back to its original position. In the long run, the drop in oil prices has no long run effect on output and inflation. e. See Figure An increase in government purchases shifts the AD curve to the right and increases output and inflation in the short run. If the Fed does not change its monetary policy rule, output will return to potential but inflation will be permanently higher. 3. Refer to the figure below: a. The economy is initially in long-run equilibrium when it is hit by both an inflation shock (shifting AS to the left) and a shock to potential output (reducing potential GDP from Y 1 to Y 2 and shifting LRAS to the left). The AD curve is unchanged. In the new long-run equilibrium, output is lower and inflation is higher. b. If the Fed responds to the oil price increase by tightening policy, the AD curve will shift left, along with the leftward shift of both the AS and LRAS curves. Inflation will not increase as much the long run, but the short-run decline in output could be even worse,

3 depending on how much the Fed tightens monetary policy. Output in the long run will equal the new, lower level of potential output, whether the Fed responds or not (monetary policy cannot affect potential output and thus cannot affect output in the long run). 5. Working with the AD-AS model using equations, part 1: a. In the short run, the equilibrium inflation rate and output level are given by the intersection of the AD and AS curves. Algebraically, the short run equilibrium level of output is found by substituting the current inflation rate into the AD equation. Doing this, we have: Y = 13,000 20,000π Y = 13,000 20,000(0.04) Y = 12,200 The economy has an expansionary gap since potential output is 12,000 and actual output is 12,200. b. In the long run, the equilibrium inflation rate and output level are given by the intersection of the LRAS and AD curves. Algebraically, the long-run equilibrium inflation rate is found by substituting the level of potential output (in this case, 12,000) into the AD equation. Doing this, we have: 12,000 = 13,000 20,000π 1,000 = 20,000π 1,000 = π = 0.05 = 5% 20, Working with the AD-AS model using equations, part 2: a. In the initial equilibrium inflation is 10%. Substituting into the AD curve, Y = 1,000-1,000π Y = 1,000-1,000(0.10) Y = 900 The economy is experiencing a recessionary gap: current output (900) is less than potential output (950). In the long run, the equilibrium output level is the level of potential output, 950. The long run equilibrium inflation rate is found by substituting potential output (in this case, 950) for Y in the AD curve equation and solving for the inflation rate: 950 = π 50 = 1000π 50 = 0.05 = 5% 1000

4 b. The initial values for the inflation rate and the output level are listed below in the row labeled Quarter 0. The resulting inflation rate and output level for each quarter (1 through 5) are listed. Note that in this example, this quarter s inflation rate is determined from last quarter s inflation rate and the difference between actual and potential output from the previous quarter (i.e. inflation occurs with a lag). Note that over time the inflation rate appears to be converging on the long run equilibrium inflation rate, 5%. Note also that the recessionary gap gets smaller each quarter as the economy moves toward potential GDP. Chapter 26 Questions Quarter Inflation Rate Y Y* Y Y * In the short run, a monetary tightening shifts the AD curve to the left. This reduces the both the inflation rate and the short-run level of output. However, in itself this has little or no effect on the inflation rate because of inflation inertia. Over time, as inflationary expectations are reduced, the recessionary gap caused by the policy eventually causes inflation to decline, and it will continue to fall until the economy returns to long-run equilibrium. At that point, actual output has returned to potential and the inflation rate has been stabilized at the new, lower, target inflation rate. 2. An increase in taxes shifts the aggregate demand curve to the left. If the Fed does not change its monetary policy rule, real GDP will fall, creating a recessionary gap and inflation will fall due to the recessionary gap. Over time, the AS shifts to the right as inflationary expectations fall and, as a result, actual inflation will begin to fall and output will return to potential. The situation is different if the Fed chooses to adjust its target real interest rate to the new longrun real interest rate at which saving equals investment. Since taxes are higher, this implies that government saving is higher (for a given level of government spending) and thus national saving increases. This implies that, given a stable demand for investment, the long-run real interest rate will be lower after the increase in taxes than it was before. Thus, the Fed needs to lower its long-run target for the real interest rate, and to do this it must loosen monetary policy in response to the tax increase. This will shift the AD curve to the right and offset some or the entire leftward shift in AD caused by the tax increase. Output will eventually settle at its potential level, but inflation will be higher than in the situation where the Fed does not adjust its monetary policy rule. 3. See Figures 26.4 and The sudden increase in oil prices shifts the AS curve to the left and the economy moves to a new equilibrium with higher inflation and a recessionary gap. At this

8 policy rule, the decline in output will be larger than if it had loosened monetary policy; however, if the recession is short, the economy will benefit in the long run by having a lower inflation rate. On the other hand, if it accommodates the decline in house prices, the recession may be milder at the cost of higher inflation in the short run. Unfortunately, this was exactly the situation that the Federal Reserve faced in 2007 and Chapter 19 Questions 1. Since 1870 real GDP per person has grown more than tenfold in the U.S. and many other industrial countries; and by 25-fold in Japan. These large increases in output per person have led to substantial increases in the material standard of living of the average person in these countries. By contrast, growth has been much slower in countries such as Ghana, which has led to a widening gap in standards of living between the high-income and lowincome countries. 2. Average labor productivity times the share of the population that is employed equals real GDP per person. Real GDP per person is a basic determinant of long-run living standards. The share of the population that is employed can only rise so far, given the fact that there are always children, retired people, etc. Thus, large long-term gains in real GDP per person, and hence living standards, must come from increases in average labor productivity. 3. Human capital is the talents, education, training, and skills of workers. Human capital is important because workers with more human capital are more productive, implying higher levels of output per worker and higher living standards. New human capital is created through investment in people, as when individuals spend time and money acquiring an education, or an employer devotes resources to training workers. 4. To get the most output (in terms of ditches dug), you should give the first shovel to the strongest worker, the next shovel to the second strongest worker, and so on until you run out of shovels. Because a stronger worker can make better use of a shovel than a worker who weaker, this strategy is consistent with the Low-Hanging Fruit Principle: limited resources should be devoted first to their most productive uses. Since workers without shovels produce nothing, the more shovels you have, the more total output and output per worker will be produced; thus extra capital (shovels) enhances average labor productivity. However, because an extra shovel will be used by a worker who is weaker than those who already have shovels, the extra output made possible by each additional shovel is declining, which is what is meant by the term diminishing returns to capital. 5. Economists generally agree that the resurgence in productivity growth since 1995 was the product of rapid technological progress, driven primarily by increased investment in new information and communication technologies (ICT). Economists base this hypothesis on

9 evidence that growth in industries that either produce or use ICT experienced acceleration in productivity while there was no acceleration in those industries that neither produce nor use much ICT. 6. Entrepreneurs are people who create new business enterprises. By combining workers with new and more productive technologies or by having the same workers produce more highly valued products and services, entrepreneurs increase the productivity of any given set of workers. Effective managers (who oversee the day-to-day operations of businesses) also increase productivity, through activities such as improving the organization of production, finding the best matches of workers and jobs, obtaining necessary financing, and coordinating the firm s activities and needs with those of its suppliers and customers. 7. Policies that governments can use to promote growth include the following: encouraging the development of human capital (for example, by support of education); encouraging high rates of saving and investment (for example, through tax breaks); making public investments in infrastructure (such as highways, bridges, and communications networks); supporting basic research. Providing a political and legal environment conducive to growth, including a stable political system, well-defined property rights, free and open exchange of ideas, and a tax and regulatory system favorable to entrepreneurship and other economically productive activities. 8. Environmental fragility and limited resources may impose limits on the expansion of current types of economic activities (e.g. more and more cars, more and more coal-fired power plants.) Global environmental problems, such as global climate change, are not handled very well by the market or by individual national governments and are definitely cause for concern. However, there are reasons to believe that that the limits to growth thesis may be overstated. These include, but are not limited to, the following: Economic growth includes the development of better and more efficient products and services, which may be less taxing on the environment than current products; economic growth provides additional resources that can be used to help protect the environment; market mechanisms will tend to alleviate shortages of resources by dampening demand and encouraging supply, as happened in the 1970s energy crisis and seems to be happening today (2008) as oil prices rise.. Problems 1. After one year, Richland s real GDP per person equal \$10,000*(1.01), after two years it equals \$10,000*(1.01)*(1.01) = \$10,000*(1.01) 2, and so on. After ten years, Richland s GDP per person equal \$10,000*(1.01) 10 = \$11,046, and after twenty years it equals \$10,000*(1.01) 20 = \$12,202.

10 Poorland s GDP per person after ten years is \$5,000*(1.03) 10 = \$6,720, and after twenty years it equals \$5,000*(1.03) 20 =\$9,031. Thus, Poorland has gone from half the level of income of Richland to about three-quarters the level in Richland in twenty years. Suppose that GDP per person in Richland and Poorland are equal after t years; our objective is to find t. After t years Poorland s GDP per person is \$5,000*(1.03) t, and Richland s GDP per person is \$10,000*(1.01) t. Setting these two expressions equal, and dividing both sides by \$5,000, we get (1.03) t = 2*(1.01) t By solving the above equation for t (algebraically, graphically, or by trial and error), we find that Poorland catches up in between 35 and 36 years. 6. Productivity in check-out lines: a. With four employees and two lanes, both lanes have a checker and a bagger. Total 80 customers per hour output is 80 customers per hour. Average labor productivity is = 4 workers 20 customers per hour per worker. b. A bagger increases output by 15 customers per hour (the difference between the 40 customers serviced by a checker and a bagger and the 25 customers served by a checker alone.) If there is an empty lane available, a checker working alone increases output by 25 customers. So the best strategy is to take one of the baggers and make him or her a checker in the new lane. Total output is then 90 customers per hour (40 for the checker and bagger plus 25 for each checker working alone) and average labor productivity is 22.5 customers per hour. Note that adding capital (the extra lane) increases both total output and average labor productivity. c. With four lanes, all four employees become checkers. Total output is 100 customers and average labor productivity is 25 customers per hour. Because there are only four employees, a fifth lane adds no output (average labor productivity remains 25 customers per hour). We therefore do observe diminishing returns to capital, at least for the fifth lane: Adding a third lane increased output by 10 customers per hour, as did adding a fourth lane. However, adding a fifth lane does not increase output further. 8. Productivity in fishing: a. Zero, as that will allow her stock of fish to double by next year. b. Maximizing the growth of her stock of fish has the disadvantage that it allows Hester no current income to spend. In other words, Hester can have the benefit of a very high income and consumption next year only at the cost of starving herself this year. Analogously, the more a country is willing to starve itself this year, by saving and investing its resources in new capital goods rather than consuming, the faster it will grow. c. To maximize her current income Hester should sell all her fish this year, realizing \$5000. The problem with this strategy is that it leaves no source of income for the future.

11 d. If Hester harvests none of her fish this year, she has no income this year; and if she harvests all of her fish this year, she has no income next year. Having very low or zero income in either year is very unpleasant for Hester. A better choice is to sell some fish this year, allowing for a reasonable level of current income and consumption, while leaving enough fish in the hatchery to provide for reasonable income in the future as well. In the same way, a country should choose a rate of economic growth that balances the cost of sacrificing consumption today against the benefits of higher income and consumption in the future.

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