Why the aggregate supply curve slopes upward and identifies its three ranges. Similarly, explain why the aggregate demand curve slopes downward. How a country, such as the United States, is able to run a persistent current account deficit. Is there a limit to how long this can continue? The consensus of economists and business analysts is for faster economic growth in the U.K. relative to the U.S. Firms in the U.K. are also projecting excellent profits. What are the implications for the exchange rate of the dollar for the British pound? The effect of expansionary monetary policy on the real risk-free interest rate (R), real GDP, and the price index (PI). Many countries in Africa have suffered though decades of low GDP growth. What advice can you offer?