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Why are capital gains taxed at a lower rate than normal income? 
Were capital gains taxes not lower, companies would have an incentive to minimize the portion of the value they create that materializes as capital gains. They would do this by using more debt financing (since interest is deductible) than equity financing. This would have a destabilizing effect on the economy. Low capital gains taxes help encourage investment over spending. This is believed to improve economic growth. Given these factors, it is generally believed that the current capital gains tax rate is very close to the optimal rate. That is, a higher tax rate would not result in greater tax revenue. Bluntly, a higher income tax rate on earned income does not really discourage people from working harder and earning more money. But a higher rate on capital gains does discourage investment. Essentially, it's because investment is more discretionary.