A Giant Pyramid Scheme:

"A Ponzi scheme is a form of pyramid scheme in which new investors must continually be sucked in at the bottom to support the investors at the top. In this case, new borrowers must continually be sucked in to support the creditors at the top. The Wall Street Ponzi scheme is built on "fractional reserve" lending, which allows banks to create "credit" (or "debt") with accounting entries. Banks are now allowed to lend from 10 to 30 times their "reserves," essentially counterfeiting the money they lend. Over 97 percent of the U.S. money supply (M3) has been created by banks in this way. The problem is that banks create only the principal and not the interest necessary to pay back their loans. Since bank lending is essentially the only source of new money in the system, someone somewhere must continually be taking out new loans just to create enough "money" (or "credit") to service the old loans composing the money supply. This spiraling interest problem and the need to find new debtors has gone on for over 300 years."

- Ellen Brown, Global Research