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As I understand it, if $100 are deposited, the bank can lend out $900 of it. That means that there are $1000 in the system while $900 are lent out and $100 (or 10%) remain at the bank as the reserve requirement.
No. Under a 10% reserve requirement, the bank can lend $90 of a $100 deposit. Once that $90 is lent and deposited somewhere (even the same bank), there will then be $190 in deposits (up from $100) and still $100 in total reserves.
Brian
Brian,
He probably got that information from a movie or a book. It is played out more dramatically when you watch a movie or read a book about banking. They assume a money multiplier of somewhere near 9, and tell their audiences to simply multiply the starting amount (in this case $100) by 9 to get the total amount of money (or credit) floating in the economy from that original $100.
The catch is (and what MOST movies and books don't stress) is so many other things go into calculating the money multiplier and it is rarely at 9 (if ever). Depending on the objective of the source they may not go over this information. If the source wants money to seem like debt and modern day slavery, then why wouldn't they make it seem worse than it is?