15. Revenue from the inflation tax: The amount of money the government raises from the ination tax is AM. Use the FRED database for the last period in each year to answer the following questions: (a) How much currency was in circulation in 1981? What was the size of the monetary base in 1981? (b) If the monetary base is the measure of M, how much revenue was raised from the ination tax between 1980 and 1981, in dollars? What fraction was this of 19 8 1 GDP? (c) Why does this exercise ask you to do these calculations for the year 1981 instead of some other year? Use quarterly values for all your calculations (i.e last quarter of 1981). For Monetary Base use BOGMBASE. For Currency: Monetary Base; Cur- rency in Circulation (MBCURRCIR); For the actual inflation rate: Gross Domestic Product: Implicit Price Deflator (GDPDEF); For GDP - Gross Domestic Product (GDP)