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# Intermediate Macroeconomics

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1. Two economies, Hare and Tortoise, each start with a real GDP per person of \$5000 in 1950. Real GDP per person grows 3% per year in Hare and 1% per year in Tortoise. In the year 2000, what will be real GDP per person in each economy? Make a guess first; then use a calculator to get the answer.

2. Over the past twenty years an economy's total output has grown from 1000 to 1300, its capital stock has risen from 2500 to 3250, and its labor force has increased from 500 to 575. All measurements are in real terms. Calculate the contributions to economic growth of growth in capital, labor, and productivity
a) assuming that AK = 0.3 and AN = 0.7.
b) assuming that AK = 0.5 and AN = 0.5.

3. For a particular economy, the following capital input K and labor input N were reported in four different years:

Year K N
1 200 1000
2 250 1000
3 250 1250
4 300 1200

The production function in this economy is Y = K^0.3 * N^0.7, where Y is total output.
a) Find total output, the capital-labor ratio, and output per worker in each year. Compare year 1 with year 3 and year 2 with year 4. Can this production function be written in per-worker form? If so, write algebraically the per-worker form of the production function.
b) Repeat part (a) but assume now that the production function is Y = K^0.3 * N^0.8

4.
Economic Growth in Eight Major Countries, 1870- 1998

Levels of real GDP per capita
Annual Growth Rate
Country 1870 1913 1950 1998 1870 -1998

Australia 3,645 5,715 7,493 20,390 1.4%
Canada 1,695 4,447 7,437 20,559 2.0
France 1,876 3,485 5,270 19,558 1.8
Germany 1,821 3,648 3,881 17,799 1.8
Japan 737 1,385 1,926 20,084 2.6
Sweden 1,664 3,096 6,738 18,685 1.9
United Kingdom 3,191 4,921 6,907 18,714 1.4
United States 2,445 5,301 9,561 27,331 1.9

Use the data above to calculate annual growth rates of GDP per capita for each country listed over the period 1950 - 1998. [Note: The annual growth rate z will satisfy the equation
(1 + z)^48 = GDP1998 / GDP1950. To solve this equation for z using a calculator, take logs of both sides of the equation.] You will find that Germany and Japan, two countries that suffered extensive damage in World War II, had the two highest growth rates after 1950. Given a reason, based on the analysis of the Solow model, for these countries' particularly fast growth during this period.

5. An economy has the per-worker production function yt = 3kt^0.5, where yt is output per worker and kt is the capital-labor ratio. The depreciation rate is 0.1, and the population growth ate is 0.05. Saving is St = 0.3Yt, where St is total national saving and Yt is total output.

a) What are the steady-state values of the capital-labor ratio, output per worker, and consumption per worker?

The rest of the problem shows the effects of changes in the three fundamental determinants of long-run living standards.

b) Repeat part (a) for a saving rate of 0.4 instead of 0.3.
c) Repeat part (a) for a population growth rate of 0.08 (with a saving rate of 0.3).
d) Repeat part (a) for a production function of yt = 4kt^0.5. Assume that the saving rate and population growth rate are at their original values.

6. Consider a closed economy in which the population grows at the rate of 1% per year. The per-worker production function is y = 6&#8730;k, where y is output per worker and k is capital per worker. The depreciation rate of capital is 14% per year.

a) Households consume 90% of income and save the remaining 10% of income. There is no government. What are the steady-state values of capital per worker, output per worker, consumption per worker, and investment per worker?
b) Suppose that the country wants to increase its steady-state value of output per worker. What steady-state value of the capital-labor ratio is needed to double the steady-state value of output per capita? What fraction of income would household have to save to achieve a steady-state level of output per worker that is twice as high as in part (a)?

7. Both population and the work force grow at the rate of n = 1% per year in a close economy. Consumption is C = 0.5(1 - t)Y, where t is the tax rate on income and Y is total output. The per-worker production function is y = 8&#8730;k, where y is output per worker and k is the capital-labor ratio. The depreciation ate of capital is d = 9% per year. Suppose for now that there are no government purchases and the tax rate on income is t = 0.

a) Find expressions for national saving per worker and the steady-state level of investment per worker as functions of the capital-labor ratio, k. In the steady state, what are the values of the capital-labor ratio, output per worker, consumption per worker, and investment per worker?
b) Suppose that the government purchases good each year and pays for these purchases using taxes on income. The government runs a balanced budget in each period and the tax rate on income is t = 0.5. Repeat part (a) and compare your results.