How Banks Actually Work

Peek behind the curtain of central banking, fractional reserves, and how new money is created from thin air. Covers 2008, 2023 banking failures, and the specific mechanics most people never learn.

11 min · beginner · part of The Foundation: Why Crypto Exists

The Banking System Nobody Explains

Most of us use banks every day without understanding what actually happens behind the scenes. We deposit money, swipe our cards, and assume our savings sit safely in a vault. The reality is far more surprising, and understanding it is essential to grasping why cryptocurrency was invented. The modern banking system is built on a set of assumptions and practices that would shock most people if they fully understood them. This lesson pulls back the curtain on how money is actually created, how banks really operate, and why the system works most of the time but occasionally fails catastrophically. By the end of this lesson, you will have a clear picture of the machinery that runs the global financial system, and you will understand why many people believe that machinery needs an upgrade.

Also in this lesson

What Central Banks Actually Do
Fractional Reserve Banking Explained
Where New Money Really Comes From
Why This Matters for Crypto
How Payments Actually Settle
For Deeper Reading

Key terms

Central bank: The institution at the top of a country's banking system that sets interest rates, manages money supply, and acts as a lender of last resort. The U.S. Federal Reserve, European Central Bank, and Bank of Japan are major examples.
Fractional reserve banking: A system where banks keep only a fraction of deposits in reserve and lend out the rest, effectively multiplying the money supply through the credit creation process.
Quantitative easing (QE): A central bank policy of creating new money to purchase financial assets like government bonds, increasing money supply and lowering long-term interest rates. Used heavily 2008-2014 and 2020-2022.
Bank run: A situation where many depositors withdraw their money simultaneously, potentially causing a bank to fail due to insufficient reserves. Silicon Valley Bank in March 2023 is a recent example.
FDIC: Federal Deposit Insurance Corporation, a U.S. government agency that insures bank deposits up to $250,000 per depositor per bank. The 2023 SVB rescue extended insurance to all deposits via "systemic risk exception."
Money multiplier: The factor by which the money supply increases through fractional reserve lending. With a 10% reserve requirement, $1 in reserves can support $10 in deposits.
M2 money supply: A measure of the total dollars including cash, checking, savings, and money market funds. U.S. M2 grew from $15.4T (Feb 2020) to $21.7T (April 2022), a 41% expansion.
SWIFT: Society for Worldwide Interbank Financial Telecommunication. The messaging network that banks use for international wire transfers. Transfers typically take 3-5 business days and involve correspondent banks taking fees.
ACH (Automated Clearing House): The U.S. domestic batch payment network. ACH transfers typically settle in 1-3 business days. Slower than crypto rails but free or low-cost for users.
Bank Term Funding Program (BTFP): Emergency lending facility created by the Federal Reserve in March 2023 in response to the SVB collapse, allowing banks to borrow against held-to-maturity securities at face value.

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Educational only — not financial advice.