Week Eight Individual Assignments. The multiplier effect is an economic principle that outlines how a change in economic activity has an exponential effect on the overall economy.True or False: The money multiplier will increase. True or False: As a result, the overall change in the money supply will remain unchanged. False The multiplier effect refers to the proportional amount of increase, or decrease, in final income that results from an injection, or withdrawal, of capital. In the following data table, calculate the amount of excess reserves and the monetary base and then use the table to answer the questions that follow. Guide to Money Multiplier Formula. Here we discuss how to calculate it along with Examples, a Calculator, and a downloadable excel template. 1. List at least three of your financial goals. It would effect the money multiplier and make it decrease because banks are lending less money, which means less money is being created.