A pyramid scheme, e.g., is a type of SCAM in which participants attempt to make money solely by recruiting more members into the scheme. It is an unsustainable business model that relies on recruiting an ever-increasing number of people in order to make money. Participants typically make money from the fees paid by new recruits, rather than from any actual product or service. Pyramid schemes are illegal in many countries and can be very damaging to those who participate.