The 1920s 'Investment Trust' craze

Imagine a company that doesn't actually make anything. No cars, no radios, no steel. Its only "job" is to buy stock in other companies that also don't make anything.

This was the 1920s Investment Trust craze, a giant game of financial inception. You’d buy into Trust A, which owned Trust B, which owned Trust C, creating a massive tower of theoretical wealth built on nothing but leverage and optimism.

When the 1929 crash hit, these nesting dolls didn't just shrink; they vaporized. It turns out that stacking IOUs on top of IOUs is a great way to turn a market dip into a total civilization-wide reset.

But how did they make money if they weren't actually producing anything?

They didn't make money in the sense of selling bread or cars; they made "math." If the stock of the company you owned went up by 10%, your trust was suddenly "worth" 10% more on paper. You’d simply report that growth as profit, and investors would throw more cash at you.

It was a giant, self-fulfilling prophecy. These trusts would often buy each other’s shares to artificially pump the prices. It’s like two neighbors agreeing that their identical lawns are now worth a billion dollars—on paper, the whole street is suddenly wealthy, even though nothing actually changed.

They also used massive leverage, which is just a polite term for gambling with borrowed money. They’d borrow nine dollars for every one dollar they actually owned. This meant that as long as the market ticked up slightly, they looked like geniuses, but it also meant they had zero safety net when the music finally stopped.

If they only had one dollar, who gave them the other nine?

Mostly the banks, who were suffering from a severe case of FOMO. Back then, there weren't many rules stopping a bank from taking the money in your savings account and handing it over to a trust to gamble on the latest bubble.

The banks saw these trusts doubling their money on paper and decided they wanted in on the "free" cash. They weren't just lenders; they were enablers, fueling the fire with other people's life savings because everyone assumed the party would never end.

It was the ultimate "trust me, bro" economy. Everyone assumed the banks knew what they were doing, while the banks assumed the trusts were geniuses. In reality, they were all just passing around the same stick of dynamite with a very short fuse.

Wait, so what happened when everyone tried to withdraw their money at once?

Total chaos. Once the bubble popped, word spread that banks had spent everyone's rent money on financial magic beans. People sprinted to the bank to grab their cash before the next guy.

This was the classic "bank run." Since the bank had already gambled that cash away, the vaults were empty. You’d show up to find the doors locked and your life savings gone.

It was a brutal reminder that a bank balance is just a promise. In 1929, thousands of those promises evaporated, proving that "trust" is a terrible substitute for actual collateral.

Did the government really just stand by and watch the world burn?

Pretty much. Back then, there was no FDIC—the insurance that protects your savings today. The government’s policy was basically "tough luck," as they waited for the market to magically heal itself.

President Herbert Hoover was like a captain of a sinking ship who insisted the freezing water was just a "state of mind." By the time he realized the market wasn't going to fix itself, the damage was done.

It took a total wipeout to prove that letting banks gamble with rent money was a great way to end up in a cardboard box.