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How can I determine if my portfolio's rate of return has been “good”, or not?
There isn't really enough information here to go on.  Without knowing when you invested that money we can't find your rate of return at all, and it's important to measure your rate against risk.  If you take on significantly more risk than the overall market but only just barely outperform it, you probably got a lousy rate of return. If you underperform the market but your risk is significantly lower then you might have gotten a very good rate of return.  A savings account earning a guaranteed 4% might be a better return than gambling on the roulette wheel and making 15%.