The United States is a creditor nation

Suppose in a country, the working-age population doubles due to immigration. However, the country neglects investment in research and development and hence the country's level of technology is stagnant

Which of the following statements will be true of this economy? A) The economy will experience steady economic growth. B) The savings rate will remain stagnant over the years. C) The economy's output will rise at an increasing rate over time. D) The economy cannot achieve a sustained growth.

Suppose that the federal government had a budget deficit of $80 billion in year 1 and $90 billion in year 2, but that it experiences budget surpluses of $40 billion in year 3 and $20 billion in year 4

Also assume that the government uses any budget surpluses to pay down the public debt. At the end of these four years, the Federal government's public debt would have A) increased by $110 billion. B) decreased by $57.5 billion. C) increased by $230 billion. D) decreased by $110 billion.