Ponzi scheme

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A Ponzi scheme is a fraudulent investment operation that involves paying abnormally high returns ("profits") to investors out of the money paid in by subsequent investors, rather than from net revenues generated by any real business, named after Charles Ponzi.


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Overview
A Ponzi scheme usually offers abnormally high short-term returns in order to entice new investors. The high returns that a Ponzi scheme advertises (and pays) require an ever-increasing flow of money from investors in order to keep the scheme going.

The system is doomed to collapse because there are little or no underlying earnings from the money received by the promoter. However, the scheme is often interrupted by legal authorities before it collapses, because a Ponzi scheme is suspected and/or because the promoter is selling unregistered securities. (As more and more investors become involved, the likelihood of the scheme coming to the attention of authorities will continue to increase.)

The scheme is named after Charles Ponzi, who became notorious for using the technique after emigrating from Italy to the United States in 1903. Ponzi was not the first to invent such a scheme, but his operation took in such a large amount of money that it was the first to become known throughout the United States. Today's schemes are often considerably more sophisticated than Ponzi's, although the underlying formula is quite similar and the principle behind every Ponzi scheme is to exploit lapses in judgment arising out of greed.
 

What is and is not a Ponzi scheme

A pyramid scheme is a form of fraud similar in some ways to a Ponzi scheme, relying as it does on a disbelief in financial reality, including the hope of an extremely high rate of return. However, several characteristics distinguish pyramid schemes from Ponzi schemes:
In a Ponzi scheme, the schemer acts as a “hub” for the victims, interacting with all of them directly. In a pyramid scheme, those who recruit additional participants benefit directly (in fact, failure to recruit typically means no investment return).
A Ponzi scheme relies on some esoteric investment approach, insider connections, etc., and often attracts well-to-do investors; pyramid schemes explicitly claim that new money will be the source of payout for the initial investments.
A pyramid scheme is bound to collapse a lot faster, simply because of the demand for exponential increases in participants to sustain it (Ponzi schemes can survive simply by getting most participants to "reinvest" their money, with a relatively small number of new participants).
Worldcom and other financial frauds. Worldcom did not pay out high returns (that is, high dividends). Worldcom was a publicly traded company which used expectations from the internet/dotcom boom and various fraudulent accounting schemes to inflate publicly reported profits to keep its stock high. Investors were free to sell at any time; when they did, the company wasn't the one paying the investor -- it was the person buying the stock who paid, and took the risk at that point.
A bubble. A bubble relies on suspension of disbelief and an expectation of large profits, but it is not the same as a Ponzi scheme. A bubble involves ever-rising (and unsustainable) prices in an open market (be that shares of a stock, housing prices, the price of tulip bulbs, or anything else). As long as buyers are willing to pay ever-increasing prices, sellers can get out with a profit. And there doesn't need to be a schemer behind a bubble. (In fact, a bubble can arise without any fraud at all - for example, housing prices in a local market that rise sharply but eventually drop sharply because of overbuilding.)
Robbing Peter to pay Paul. When debts are due and the money to pay them is lacking, whether because of bad luck or deliberate theft, debtors often make their payments by borrowing or stealing from other monies they have. It does not follow that this is a Ponzi scheme. From the basic facts set out, it is not, because there is no indication that the lenders were promised unrealistically high rates of return via claims of unusual financial investments. Nor (from these basic facts) is there any indication that the borrower (banker) is progressively increasing the amount of borrowing ("investing") to cover payments to initial investors (as, again, Ponzi was not the first to do.)