A Ponzi scheme is a type of investment fraud. It works by paying returns to earlier investors using money from newer investors. Instead of generating legitimate profits from a business venture, the organizer simply shuffles money from one group to the next.

The scheme creates the illusion of a successful enterprise. Early investors receive impressive returns, which makes them feel secure and encourages them to invest more. Their success stories then attract a new wave of investors, providing the cash needed to continue the cycle. The person running the scheme siphons off money for themselves along the way.

This process can only continue as long as new money is flowing in. Once the stream of new investors dries up, the whole structure collapses.

The scam is named after Charles Ponzi, an Italian immigrant who orchestrated a massive fraud in the 1920s. He promised investors an incredible 50% return in just 45 days. His plan supposedly involved buying international postal reply coupons in one country and redeeming them for more valuable postage stamps in another.

While there was a real business concept behind it, it was never going to generate the returns Ponzi promised. In reality, he was just paying early investors with money from those who came later. The scheme grew rapidly, attracting millions of dollars. But within a year, it fell apart, leaving most of his investors with nothing.

All Ponzi schemes share a few core characteristics. They typically promise very high returns with little or no risk, a combination that is almost always too good to be true in legitimate investing. They also rely on a steady stream of new cash to survive.

The need for ever-increasing investment is what makes these schemes unsustainable. At some point, the organizer can no longer find enough new people to pay off the existing investors, and the entire house of cards comes tumbling down. When the scheme collapses, the newest investors almost always lose all their money.