Please show explanations and any algebraic solutions that may apply. Thank you.

1. The COVID-19 pandemic in 2020 had devastating effects on Brazil's economy, as in many other countries. Brazilian households experienced significant restrictions in their access to many consumption goods and services. This meant that as a result of the pandemic, consumption expenditure had fallen sharply for every given level of household real income and wealth. Additionally, the prospects of reduced demand and production difficulties under pandemic conditions discouraged investment in the country. As a result, investment declined for every given rate of interest. These changes, however, did not change the price level, the net export function, or the propensity to hold money. Assume that the pandemic effects and any policy responses to them were all viewed as temporary by the households and firms. Also, assume that the interest parity condition held, and money and product markets reached equilibrium in 2020. Finally, treat the conditions and policies in the rest of the world as given.

(a) If there had been no policy response to the pandemic, what would have happened to the aggregate preferred expenditure curve (D curve) of Brazil's economy in 2020? Why?

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(b) If there had been no policy response to the pandemic, what would have happened to the IS and LM curves of Brazil's economy in 2020? [Hint: Please keep in mind that we are assuming the propensity to hold money had not changed in 2020.]

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(c) If there had been no policy response to the pandemic, what would have happened to the equilibrium level of real income, nominal interest rate, exchange rate, and net exports of Brazil's economy in 2020?

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(d) In most countries shocked by the pandemic, central banks expanded money supply and governments increased their expenditures temporarily. In Brazil, the central bank adopted an expansionary monetary policy to substantially lower the interest rate so that it reached 4%, which was below the rate that would have prevailed in the absence of policy response as in part (c). But, unlike most other countries, the government of Brazil left its fiscal expenditure unchanged. How did these policies affect the equilibrium level of real income, exchange rate, and net exports, based on your analysis how these policy changes impacted IS and LM? [Treat the situation in part (c) with no policy change as the base case and compare the outcomes of intervention to that.]

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