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Capitalism is nothing but a giant pyramid scheme.
(infosec.pub)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Yes, but most people using the term don't know their defitition, so knowing the correct definition is of limited usefulness.
Ponzi is for Investments that offer high returns, by marking the principal as gains. Pyramid schemes sell stuff, through a pyramid of salesmen. Each one earns a percentage of the revenue of his underlings and is encouraged to recruit more underlings.