Midterm_2023_sol

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Feb 20, 2024

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Macroeconomics in the Global Economy Spring 2023 Midterm Exam This is a 60-minute exam. 1. The economy of Mars experienced a 9% nominal GDP growth rate and a 1% inflation rate. What real GDP growth rate did the economy of Mars experience? Choose one. a. 8% b. 10% c. -8% d. 9% Real GDP growth = Nominal GDP growth – inflation rate = 9% - 1% = 8% 2. Which of the following statements about the quantity theory of money are correct? Choose two. Recall that π = inflation rate, ࠵? ! = growth rate of money, ࠵? " = growth rate of velocity, ࠵? # = real GDP growth rate, ࠵? $# = nominal GDP growth rate. a. π = ࠵? ! + ࠵? # b. ࠵? ࠵?࠵? = ࠵? ࠵? + ࠵? ࠵? c. ࠵? " = 0 d. π = ࠵? ࠵? + ࠵? ࠵? − ࠵? ࠵? Recall the fundamental equation of the quantity theory of money: π = ࠵? ! + ࠵? " − ࠵? # . Therefore, d. is correct. Also, recall that ࠵? $# = ࠵? # − π . Then, from the fundamental equation of the quantity theory of money, you get π = ࠵? ! + ࠵? " − ࠵? $# + π. It follows that ࠵? $# = ࠵? ! + ࠵? " and option b. is correct. 3. Suppose we live in an open economy. Then, the GDP accounting equation is Y = C + G + I + NX. Which of the following statements about savings are not correct? Choose two. a. S = I – NX b. S – I = NX c. S = I d. S = Y – C – G In an open economy, S = I + NX, therefore S – I = NX and b. is correct. Consequently, a. and c. cannot be correct and are the right answers. d. is another correct definition of savings. 4. Suppose only two goods are consumed in the economy (i.e., milk and cookies). If the consumer price index increases from 100 in period 1 to 120 in period 2 and the expenditure share in milk is 0.2 and the price of cookies increased by 12%, by how much did the price of milk increase?
a. 48% b. 20% c. 52% d. 12% The change in the price index is 120 – 100 = 20. Given that the expenditure share in milk is 0.2 and only two goods are consumed in this economy, the expenditure share in cookies is 0.8 = 1 - 0.2. Therefore, 20 = 0.2 x percent increase in the price of milk + 0.8 x percent increase in the price of cookies. Therefore, 20 = 0.2 x percent increase in the price of milk + 0.8 x 12. Solving this equation, you obtain 52%. 5. Suppose the economy is experiencing high inflation because of excess demand. The Central Bank wants to achieve its 2% target inflation rate by altering credit conditions. Which of the following operations would help the Bank achieve its goal? Choose all that apply. a. Purchase government bonds from commercial banks. b. Increase the interest rate paid on excess reserves to commercial banks. c. Sell government bonds to commercial banks. d. Increase the reserve requirements for commercial banks. The only option that will not help the Central Bank is option a. Purchasing governments bonds will increase the money supply and decrease the FFR, resulting in an expansionary monetary policy that will likely drive the Central Bank away of its target. All other options are examples of contractionary monetary policies. 6. Low and stable inflation (i.e., around 2%) is desirable because… Choose all that apply. a. Allows firms to constantly increase their profit margins, thus stimulating investments. b. Allows nominal wages to decline in periods of low labor demand, thus minimizing unemployment during recessions. c. Entails small redistributive costs. d. Avoids a major cost of deflation, i.e., people anticipating purchases because of low prices. Option a. is not correct because higher prices do not translate into a generalized increase in profit margins. As prices in the economy increase, costs will increase as well. Option b. is not correct because nominal wages hardly adjust. Real wages instead do adjust in periods of low labor demand. Option c. is correct, as low inflation implies low redistributive costs of inflation. Option d. is not correct because a major cost of deflation is people postponing purchases expecting future prices to be lower than today.
7. Which of the following statements about Quantitative Easing are not correct? Choose two. a. It is usually used when the FFR reaches the zero lower bound. b. Entails the purchase of longer-term securities to encourage lending. c. Does not entail the purchase of government securities. d. Entailed the sale of very illiquid assets (MBS) to commercial banks who wanted to improve their balance sheet. Option c. is not correct. Central Banks have implemented QE purchasing a lot of government securities. Option d. is also not correct. It entails the sale of very liquid assets to commercial banks and the purchase of very illiquid assets such as MBS. 8. In 2017 as part of the Tax Cuts and Jobs Act, the U.S. government increased the generosity of a program called bonus depreciation, which is a subsidy for corporate investment. What effect do you think this policy change would have on interest rates and investment? a. Lower interest rates and higher savings/investment b. Lower interest rates and lower savings/investment c. Higher interest rates and higher savings/investment d. Higher interest rates and lower savings/investment An investment subsidy shifts out the investment demand curve, which raises both interest rates and investment/savings. 9. Consider the growth accounting method, and imagine we live in an economy characterized by the following per-capita production function: ࠵? = ࠵?࠵? ).+ where y is output per worker, A is TFP, and k is capital per worker. In one year, there was an innovation boom and TFP grew by 7%, while income per worker grew by 10%. What was the growth rate of capital per worker? a. 8% b. -2% c. 6% d. 15% The key equation to remember is ࠵? , = ࠵? - + ࠵?࠵? . . In this case, we solve for ࠵? . = 0 ! 10 " 2 , or ࠵? . = 3)14 ).+ = 6%. 10. In 2015, a new bank opens that specializes in lending to businesses owned by young people, who have traditionally been excluded from credit markets. In response, we should expect to see (select all that apply): a. The variance of the returns to capital in the entire economy should rise. b. The variance of the returns to capital in the entire economy fall. c. The marginal return to capital for businesses owned by young people should rise. d. The marginal return to capital for businesses owned by young people fall. e. The marginal return to capital for businesses owned by young people should stay constant.
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