A Ponzi scheme is a fraudulent investing scam promising high rates of return with little risk to investors. A Ponzi scheme is a fraudulent investing scam which generates returns for earlier investors with money taken from later investors. This is similar to a pyramid scheme in that both are based on using new investors' funds to pay the earlier backers.
Remember the Pak Man Telo scheme? Why is this scheme wrong? It pays dividend from deposit it collect, not from the profit as per their claim. Similar in meaning, right?