Most people believe banks lend out deposits, moving money from savers to borrowers like a giant piggy bank. This intuitive model is entirely wrong. When your bank approves your mortgage, it doesn't check its vault for spare cash. It simply types new numbers into your account. The money appears from nowhere.
The accounting magic
When a commercial bank makes a loan, it simultaneously creates a deposit. The bank's balance sheet expands on both sides: a new asset (your promise to repay) and a new liability (the deposit in your account). No pre-existing money moves anywhere. The bank has literally created new money by updating a spreadsheet.
This seems like fraud, but it's how the system is designed. The constraint isn't the amount of money in the vault but regulatory requirements: capital ratios, reserve requirements, and the central bank's willingness to provide liquidity. Banks can create money until they bump into these limits.
The Federal Reserve operates the same way at a higher level. When it buys government bonds through quantitative easing, it doesn't use tax dollars or borrow from China. It credits the selling bank's reserve account with new digital entries. Where does this money come from? Nowhere. The Fed has the legal authority to create reserve balances at will.
Why this isn't chaos
If banks can conjure money from nothing, why isn't the system in constant hyperinflation? Because money creation comes with money destruction. When you repay your mortgage, that money vanishes as surely as it appeared. The loan asset and deposit liability both disappear from the bank's balance sheet.
More importantly, this private money creation is constrained by demand. Banks can only create money by finding creditworthy borrowers willing to take loans. In a recession, even with interest rates at zero, banks often can't find enough qualified borrowers. The money supply can shrink despite the central bank's best efforts.
Central banks influence this process but don't control it directly. They set the price of reserves (the interest rate) and can flood the system with liquidity, but they can't force banks to lend or businesses to borrow. This is why monetary policy sometimes feels like pushing on a string.
Our take
The revelation that money is created by typing numbers into computers breaks most people's brains. It should. The entire monetary system rests on shared belief and institutional trust rather than physical reality. Yet this virtual system has proven remarkably robust, surviving wars, panics, and technological revolutions. Understanding money creation doesn't make the system any less strange, but it does explain why economic outcomes often defy common sense. Reality, it turns out, is more flexible than we think.
