There is a description of banking that appears in most economics textbooks and in virtually every personal finance course ever taught. It goes like this: people deposit money into banks, banks hold it in reserve and lend a portion of it out to borrowers, and the interest collected on those loans is how banks make their profit.

That description is not accurate. And the inaccuracy is not a minor technical detail. It is the entire business model.

Here is what actually happens.

When a bank approves a mortgage for $200,000, it does not pull that money from existing deposits sitting in a vault somewhere. It does not transfer funds from one account to another. It credits your account with $200,000 at the moment the loan is approved. That money did not exist before the approval. The bank created it — by entering a number into a ledger.

This is not a fringe economic theory. The Bank of England — one of the oldest central banks in the world — published a paper in 2014 titled "Money Creation in the Modern Economy" that states this plainly: "Rather than banks receiving deposits when households save and then lending them out, bank lending creates deposits. Whenever a bank makes a loan, it simultaneously creates a matching deposit in the borrower's bank account, thereby creating new money."

The Bank of England. In their own published research. Confirming that what most people believe about how banks work is not accurate.

Now consider what this means for that $200,000 mortgage. On a thirty-year loan at six percent, you will pay approximately $231,000 in interest over the life of the loan — making your total payments roughly $431,000. The bank collects $431,000 in total on money it created at the cost of a keyboard entry. It did not save that money. It did not earn it through production or labor. It created it and then collected interest on the full amount as though it had always existed.

Multiply that across the entire U.S. banking system — tens of trillions of dollars in outstanding mortgages, auto loans, student loans, business loans, and credit cards. Every one of those loans represents money that was created at the moment it was issued. Every one generates interest income for the institution that issued it. Interest income on money created from nothing.

For most of the twentieth century there was at least a structural constraint on this process — the reserve requirement. Banks were required to hold a minimum percentage of deposits in reserve, limiting how far the money creation cycle could run. For large banks this was typically around ten percent, meaning a $1,000 deposit could theoretically support up to $10,000 in total loans circulating through the economy.

In March 2020, the Federal Reserve reduced the reserve requirement to zero percent for all depository institutions. The official announcement framed it as a technical measure to support lending during the pandemic. What it also did was remove the last structural limit on how much money the banking system can create through lending.

There is currently no legal minimum reserve requirement for banks in the United States.

None of this is illegal. All of it is documented. And understanding it changes how you see every financial decision in front of you — because the system you are navigating was not designed to serve you. It was designed to create money through debt and collect interest on what it created.

That's the terrain. Navigating it starts with understanding it clearly.

This is Chapter Three of Pathfinders: Money Decoded — available now on Amazon.

Welcome to the territory. Let's figure out where we're going.

— L.J. Casados