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An understanding of macroeconomics is valuable because it can help Select one: a. to minimize the amount of tax an individual owes b. us to understand why some firms earn more economic profit than others O c. in making purchase decisions O d. minimize the opportunity cost of making poor decisions O e. us to understand the forces that determine how fast the economy grows In the aggregate demand-aggregate supply model, an increase in the price level will Select one: a. decrease money demand, lower the interest rate, increase aggregate expenditure, and increase real GDP b. increase money demand, raise the interest rate, reduce aggregate expenditure, and decrease equilibrium real GDP O c. not change money supply, money demand or the interest rate, but will shift the aggregate demand curve to the right ad. decrease the money supply, raise the interest rate, reduce aggregate expenditure, and decrease real GDP O e. increase the money supply, lower the interest rate, increase aggregate expenditure, and increase real GDP