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This essay sheds light on what is the money multiplier effect, elucidates how the money multiplier effect is calculated, explicates how the economy is affected by the money multiplier effect in the economy, and expounds upon the problems with the money multiplier effect in the economy. The money multiplier effect is pervasive in the economy. "The money multiplier effect reflects the amplified change in the money supply that ultimately results from the injection into the banking system of additional reserves. The deposit multiplier provides the basis for the money multiplier effect, but the money multiplier value is ultimately less, due to excess reserves, savings, and conversions to cash by consumers". Banks are able to lend out the vast majority of the fiat currency that they receive from the cash deposits of customers and companies. Cash deposits are not limited to being in the form of tangible fiat currency notes, but can also encompass checks and money transfers. As of September of 2024, the reserve requirement ratio is 0% which allows banks to have autonomy to lend out all the fiat currency that they receive from the cash deposits of customers and companies if they choose to do so. By issuing loans, credit cards, and lines of credit, banks can generate a substantial amount of interest revenue. As of September of 2024, the highest annual percentage rate on a credit card is 36%. As of September of 2024, the highest mortgage interest rate is 6.73% on a 30-year jumbo mortgage loan. As of September of 2024, the highest personal loan annual percentage rate is 36%. The lower the credit score a person, has the higher likelihood there is that he will be disqualified for a lower interest rate on a loan, credit card, and line of credit. A person can increase his probability to qualify for a lower interest rate on a loan, credit card, and line of credit by having a super-prime credit score of 720 or higher.