Wherein the investor is promised a high return, but actually, you're just giving your money to a friend of a friend who owes money to the guy who owes money to the guy who owes money to... you.
Read more about the Classic Ponzi SchemeA Ponzi Scheme that uses the power of social proof to convince you to join in on the fun. "Hey, if it's good for me, it's good for you, right?"
Read more about the Pyramid SchemeA Ponzi Scheme that uses cryptocurrency to make it seem legit. "Trust us, we're not a Ponzi Scheme... we just use the blockchain, man."
Read more about the Bitconnect Scheme