Initial Deposit

The reserve requirement determines the share of each deposit that a bank retains rather than lends. The remaining portion can enter another bank as a redeposited payment, where the next bank applies the same reserve rule. Repeating this sequence creates successive lending rounds, so the required fraction directly constrains the potential scale of deposit expansion.

The multiplier of 1 divided by the reserve requirement describes a theoretical maximum under the fractional-reserve model, not a guaranteed increase in deposits. It assumes that banks lend the available remainder and that funds continue moving through redeposits. Actual expansion can be smaller when banks limit lending, borrowers seek fewer loans, or recipients hold cash.

Because the simple multiplier divides 1 by the reserve requirement, a larger required fraction produces a smaller multiplier, while a smaller fraction produces a larger one. This relationship shows how the reserve rule influences the number of possible lending and redepositing rounds. It provides a compact way to compare the model’s expansion potential under different reserve conditions.

To estimate potential expansion, economists identify the reserve requirement and apply the simple deposit multiplier, calculated as 1 divided by that requirement. They then use the initial deposit as the starting amount for the model’s successive rounds. The resulting figure represents possible deposit creation under the stated assumptions, rather than the amount that must occur in practice.

The framework connects banking activity with changes in the money supply by showing how retained reserves and subsequent lending can generate additional deposits. Economists can therefore use it to examine how financial conditions may influence liquidity and broader economic activity. The model also highlights why transmission depends on lending behavior and borrowing demand, not only on the reserve rule.

Tracking successive rounds helps analysts study the link between commercial-bank operations and broader monetary conditions. The sequence illustrates how one starting deposit may support repeated changes in deposits, lending, and liquidity across banks. In macroeconomics, this provides context for examining money creation and potential effects on economic activity while recognizing that actual outcomes may fall below the model’s calculated potential.