Understand the concept of the simple deposit multiplier: It is a formula used in banking to determine the maximum amount of money that can be created in the banking system through the process of deposit creation, given a required reserve ratio.
Recall the formula for the simple deposit multiplier: The formula is expressed as \( \frac{1}{\text{required reserve ratio}} \). This represents the inverse of the required reserve ratio, which is the fraction of deposits that banks are required to hold as reserves.
Analyze why \( \frac{1}{\text{required reserve ratio}} \) is correct: The required reserve ratio determines how much of a deposit must be kept in reserve and not loaned out. The multiplier shows how many times the initial deposit can be expanded in the banking system.
Compare the other options: \( 1 + \text{interest rate} \) is unrelated to the deposit multiplier, \( \text{required reserve ratio} \times 100 \) is simply a percentage representation of the reserve ratio, and \( \frac{\text{total deposits}}{\text{total reserves}} \) is a different ratio used for other analyses.
Conclude that \( \frac{1}{\text{required reserve ratio}} \) is the correct formula for the simple deposit multiplier, as it directly relates to the reserve requirement and the potential expansion of deposits in the banking system.