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Why are capital gains taxed at a lower rate than normal income? 
Every economy wants growth and for growth to come you need investments. So, you must provide some motive for people to risk their money (every investment has inherently a degree of risk or if you want uncertainty about the outcome). As a result the tax on capital gains is lower than on other types of income (because the risk is almost zero). The tax is considered in the calculation of the net interest rate. And you can see this as the interest which the investors demand in order to invest their money.