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You need to consider the growth rate relative to inflation (really, inflation of what you want to use the fund for - in general, education and housing costs go up faster than the 'general' rate of inflation). Good investment might achieve this - but would not be guaranteed. For a safe investment, you should reckon on roughly the rate that government bonds return - maybe a little more, because you might risk a little on the stock market, on the grounds that over several years the ups and downs can be evened out a little.
Effectively the government would need to borrow now to fund this. Doing this to invest in government bonds is pointless and circular. Doing it to invest in the stock market is dangerous - it's pumping money in to artificially inflate it. If the money were given to some new project that would actually have a real return there might be a purpose to it - if you can think of something that the government will run better than the commercial sector.
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