Imagine an investment that promises huge profits with almost no risk. It sounds too good to be true, and in the case of a Ponzi scheme, it is. This type of fraud lures investors by paying returns to earlier investors with money from newer ones. Instead of generating legitimate profits from a business, the scheme just shuffles money around.

The entire structure relies on a steady stream of new cash to stay afloat. Once the new money dries up, the scheme collapses, and most investors lose everything.

The scam is named after Charles Ponzi, an Italian immigrant who became infamous in the 1920s. Ponzi didn't invent the scheme, but he perfected it on such a massive scale that his name became forever linked to it.

His plan involved international postal reply coupons. These coupons could be bought in one country and exchanged for postage stamps in another. Due to fluctuating currency exchange rates after World War I, Ponzi claimed he could buy coupons cheaply in other countries and redeem them for a much higher value in the United States. He promised investors an incredible 50% return in just 45 days.

Thousands of people rushed to invest. In the beginning, Ponzi paid the early investors as promised. Their success stories fueled a frenzy, drawing in even more money. But he wasn't actually buying many postal coupons. He was simply paying the first wave of investors with money from the second wave. Within months, he was raking in millions.

A Ponzi scheme is like a house of cards. It looks stable as long as you keep adding new cards, but it's destined to fall. The core mechanic is simple: rob Peter to pay Paul.