If you are not familiar with a Ponzi scheme,
 it is generally a fraud in which early investors are paid out from 
contributions made by later investors. The Ponzi scheme usually ends 
when new investments dry up. A recent article
 on CFO.com highlights how to avoid a Ponzi scheme. We would like to 
make sure you read one particular concept, that is, "high returns with 
little or no risk." As we discuss extensively in the textbook, the only 
way to a higher return is with increased risk. Although we would all 
like higher returns with little or no risk, centuries of investment 
history show that such an investment is not possible. If it were, 
investors would flock to that investment, driving the return down.