How does SS compound? I thought congress just spends the money, and promises to pay in the future, with checks adjusted upwards by whatever the official rate of inflation is.
Anyway, I don't like the idea of Uncle Sam playing the stock market. I don't see why anyone on the left or right would support it, the possibilities for abuse are too great. A left-wing government might start making demands on the companies it has shares in--cut CO2 output, pander to unions, sell your products below market price, and politically correct but unviable business plans in general. A right-wing government might pander to management, or treat companies it has stakes in with kids gloves, looking the other way as they commit fraud, and so forth. Both sides would probably pressure the fed for inflation in order to goose the stock market, since politicians tend to be very short sighted and don't want to face the wrath of voters whose pensions have lost money.