Money and How Banks Create It
Money is whatever does three jobs at once: settles a payment, stores value until later, and gives prices a common scale. Banks hold deposits and lend most of them out, and because each loan becomes somebody else's deposit, lending itself enlarges the quantity of money in circulation.
What a learner can do afterwards
- Name the three functions of money and test an awkward candidate against them (gold, air miles, a crypto coin)
- Trace a deposit through a bank's lending and show why the total amount of money grows
- Explain what a reserve is for and why a rush of withdrawals threatens a bank that is not insolvent
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Money is whatever people accept as payment, from shells to notes to numbers on a screen. It does three jobs at once: a medium of exchange so you need not barter, a unit of account so prices make sense, and a store of value so savings keep. Test any candidate against all three. Gold buys coffee awkwardly, air miles fail outside one airline, and volatile crypto coins wobble as a store of value.
Banks are matchmakers between savers and borrowers. They gather deposits, keep a slice in reserve, and lend the rest to home buyers and firms. Borrowers pay interest, savers earn a smaller rate, and the bank lives on the spread while judging who repays. By pooling thousands of deposits, banks turn short-term savings into the long-term loans the economy needs.
Banks do not just move money, they multiply it. Take a 100 coin deposit with a 10 percent reserve rule: the bank keeps 10 and lends 90, which lands in another bank as a new deposit. That bank keeps 9, lends 81, and the chain rolls on, each round smaller than the last. Add up every deposit and the total far exceeds the first 100 coins. The reserve ratio sets the limit.
A bank lends long and borrows short, which makes it fragile by design. Most deposits are tied up in loans, so if every saver queues at once, even a healthy bank runs dry: that panic is a bank run. Reserves cushion small shocks, deposit insurance calms savers, and central banks can lend in a crisis. Rules exist because one falling bank can scare the whole street.
Money passes three tests at once, and lending turns one deposit into many.
More to read
Introduction to Money and Banking
Money is whatever people accept as payment, from shells to notes to numbers on a screen. It does three jobs: a medium of exchange so you need not barter, a unit of account so prices make sense, and a store of value so savings keep. Test any candidate against all three. Gold stores value but buys coffee awkwardly, air miles fail as a unit of account outside one airline, and volatile crypto coins wobble as a store of value. Good money passes all three tests at once. That triple pass is why fads rarely replace real currency.
27.3 The Role of Banks
Banks are matchmakers between savers and borrowers. They gather deposits, keep a slice in reserve, and lend the rest to home buyers and firms. Borrowers pay interest, savers earn a smaller rate, and the bank lives on the spread while judging who repays. By pooling thousands of deposits, banks turn short term savings into long term loans the economy needs. They also run the payment plumbing of cards and transfers. Without banks, spare cash would sit idle while good ideas starved.
27.4 How Banks Create Money
Banks do not just move money, they multiply it. Imagine a 100 coin deposit with a 10 percent reserve rule: the bank keeps 10 and lends 90, which lands in another bank as a new deposit. That bank keeps 9, lends 81, and the chain rolls on, with each round smaller than the last. Add up every deposit and the total money far exceeds the first 100 coins. The reserve ratio sets the limit, since higher reserves mean shorter chains.
28.2 Bank Regulation
A bank lends long and borrows short, which makes it fragile by design. Most deposits are tied up in loans, so if every saver queues at once, even a healthy bank runs dry; that panic is a bank run. Reserves cushion small shocks, while deposit insurance calms savers by guaranteeing their money up to a limit. Regulators add capital rules and inspections so banks keep buffers and honest books. Central banks can lend in a crisis to stop a sound bank from collapsing. Rules exist because one falling bank can scare the whole street.
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Where it sits
Learn first
Nothing; this is a starting point.
Optional connections
Where this leads
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.