A fun one from Money Stuff:
> What percentage of her net worth should a 30-year-old professional have in the stock market? I am not going to give you investment advice, and there is a wide range of plausible answers. “Zero, put it all in Bitcoin” is I guess on the list. A popular rule of thumb would say 70% in stocks, with the other 30% in bonds and cash. There is, however, a good theoretical case that the right answer is really 200%, or 500%: Most of a young professional’s economic wealth is the present value of her future employment income, and borrowing money to buy more stocks is a good way to diversify away from that one risky asset.
> But it is not easy to put 200% of your net worth into the stock market, because where will you get the money? A mortgage on a house is a pretty standard product in the US, but a mortgage on a retirement account is not. Bloomberg’s Suzanne Woolley reports on someone trying to change that
https://www.bloomberg.com/opinion/newsletters/2025-05-13/mortgage-your-401-k