What is the minimum cash amount that can be usefully applied to generating future cash flow, that produces a relevant amount of cash flow? Looking at the US na

What is the minimum cash amount that can be usefully applied to generating future cash flow, that produces a relevant amount of cash flow? Looking at the US national deposit rate of 0.06%, you'd have to put in, I dunno, $160000 up front to get $100/year of future cash flow. That seems particularly inaccessible to those this article is speaking to. When I was a kid, it was 4.00% or higher, so I only needed $2500 up front to get $100/year of future cash flow. So, OP, since this is your self-post, in today's economic climate, what classes of opportunity remain for normal people to make money? Are any of those classes of opportunity insured against loss of principal, as FDIC savings accounts are?