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Why are capital gains taxed at a lower rate than normal income? 
Here are three key factors that you do not explicitly state: So while I cannot say exactly why the tax law is the way it is, I can infer that it encourages long-term investments rather than short-term, which would seem to be a good thing for society overall.  The fast that capital gains are taxed at all somewhat discourages cashing out investments (although I suspect it's more of a nuisance factor - the cash received is likely more on an incentive that the tax is a disincentive).