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Is the Yale/Swenson Asset Allocation Too Conservative for a 20 Something?
You can look the Vanguard funds up on their website and view a risk factor provided by Vanguard on a scale of 1 to 5.  Short term bond funds tend to get their lowest risk factor, long term bond funds and blended investments go up to about 3, some stock mutual funds are 4 and some are 5. Note that in 2008 Swenson himself had slightly different target percentages out here that break out the international stocks into emerging versus developed markets. So the average risk of this portfolio is 3.65 out of 5.  My guess would be that a typical twenty-something who expects to retire no earlier than 60 could take more risk, but I don't know your personal goals or circumstances. If you are looking to maximize return for a level of risk, look into Modern Portfolio Theory and the work of economist Harry Markowitz, who did extensive work on the topic of maximizing the return given a set risk tolerance.  More info on my question here.  This question provides some great book resources for learning as well. You can also check out a great comparison and contrast of different portfolio allocations here.