I invest in low-cost index funds, but I'd be lying if I said I understood them. I certainly don't really understand money market funds, and those are supposed

I invest in low-cost index funds, but I'd be lying if I said I understood them. I certainly don't really understand money market funds, and those are supposed to be the most reliable, safest investments out there. Hell, I don't really understand how a car is made, and I invest my life in it every time I drive one. I don't think that advice makes a lot of sense. People in modern society rely on the specialized expertise of others every day. A better way to phrase this is "don't invest in products you don't trust, and understand why you should or shouldn't trust a particular product."