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S&P 500 Dividend Yield Drops 100 BPS

No, in the long term companies eventually go bankrupt and their stocks are worth zero. This is less likely, though also possible, for governments. I can't think of a single company that I would expect would probably (greater than 50% chance) of still being as big at it is today 50 years from now. I think the difference between yields of stocks and bonds can be estimated as the GDP growth rate minus the rate difference you'd expect for stocks being riskier, which to me is about zero right now.