Initial Deposit and Multiple Expansion

When banks receive deposits, they are required to keep a fraction as reserves and can lend out the rest. This lending process allows money to circulate in the economy, creating more deposits in other banks, which can then lend again. This cycle leads to an expansion of the overall money supply.

The money multiplier is calculated as the reciprocal of the reserve requirement ratio. With a reserve requirement of 20% (or 0.20), the formula is 1 divided by 0.20, which equals 5. This means that for every dollar held in reserves, the banking system can create five dollars in total money supply through lending.

With a 10% reserve requirement, the bank must keep 10% of the $1,000 deposit as reserves, which amounts to $100. Therefore, the amount available for the bank to lend out is the initial deposit minus the reserves: $1,000 - $100 = $900.

The deposit multiplier illustrates how banks can create money through lending. It is calculated by dividing 1 by the reserve requirement ratio, indicating how much total deposits can be generated from an initial deposit. A lower reserve requirement leads to a higher multiplier, allowing banks to lend more and expand the money supply.

Deposit expansion in the banking system can be limited by various factors. Banks may choose to hold excess reserves instead of lending, customers withdrawing cash reduces available deposits for loans, and legal reserve requirements mandate a minimum reserve ratio. Each of these factors restricts the potential for banks to create new deposits through lending.

When a bank receives a new deposit, it can lend out a portion of that deposit while keeping a fraction as reserves. This process, known as fractional reserve banking, allows the bank to create new money in the economy, thus increasing the overall money supply by the amount deposited.

When a bank lends money, that amount is typically deposited into another bank account, creating new deposits. This process allows the receiving bank to lend out a portion of those deposits again, thereby expanding the overall money supply in the economy through multiple rounds of lending.

With a 25% reserve requirement, banks must keep 25% of each deposit as reserves and can lend out the remaining 75%. This means for every dollar deposited, the bank retains 25 cents and is free to loan out 75 cents, thereby facilitating more lending and stimulating economic activity.

In a fractional reserve banking system, banks keep only a fraction of deposits as reserves, allowing them to lend out the majority of deposits. This lending process creates new money in the economy, as borrowers can spend the loaned funds, leading to an expansion of the money supply based on the initial deposits.

When the reserve requirement decreases, banks are allowed to keep less money in reserve and can lend out more. This increases the money supply in the economy. The money multiplier, which is the inverse of the reserve requirement, therefore increases as the reserve percentage decreases, leading to more money being created through lending.

With a 5% reserve requirement, banks must keep $250 from a $5,000 deposit. The remaining $4,750 can be loaned out, which then gets redeposited, allowing further loans. This process continues, creating a money multiplier effect. The total potential money supply expansion can be calculated as $5,000 divided by 0.05, resulting in a maximum of $100,000.

This scenario exemplifies the concept of initial deposit and multiple expansion, as the initial $1,000 deposit is loaned out by banks, creating new deposits in other banks. This process of lending and re-depositing allows the money supply to expand significantly beyond the original deposit, illustrating the multiplier effect in banking.