The COVID-19 induced the central bankers to search the most efficient stimulus measures. As a solution, they made an unprecedented step. They lifted down the reserve requirement (RR) to zero. This was done in the United States [FRS. 2020. -Federal Reserve Actions to Support the Flow of Credit to Households and Businesses.- Accessed February 10, 2021. Board of the Governors of the Federal Reserve System] and Morocco [BKAM. 2020. -Monetary Policy Report No. 55.- Accessed from Central Bank of Morocco Website]. The existing monetary theory literature suggests that the broad money supply should go to infinity as a result. Then we may expect the rapid economic recovery. However, this may not come true. The novelty of this paper is the development of the money multiplier theory. We explain why a step to set the RR at zero may boost (though slight) the cash-intensive economy (like Morocco) and may not deliver any benefit to a mostly cashless one (like the US, Canada, or the EU).
