Fractional-Reserve Banking And Money Creation

According to traditional economics textbooks, the current monetary system amplifies initial monetary injections of money. The popular story goes as follows: if the central bank injects $1 billion into the economy, and banks have to hold 10% in reserve against their deposits, this will allow the first bank to lend 90% of this $1 billion. The $900 million in turn will end up with the second bank, which will lend 90% of the $900 million. The $810 million will end up with a third bank, which in turn will lend out 90% of $810 million, and so on.

Consequently the initial injection of $1 billion will become $10 billion, i.e., money supply will expand by a multiple of 10. Note that in this example the central bank has actively initiated monetary pumping of $1 billion, which in turn banks have expanded to $10 billion.

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