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Why are capital gains taxed at a lower rate than normal income? 
I think this question is very nearly off-topic for this site, but I also believe that a basic understanding of the why the tax structure is what it is can help someone new to investing to understand their actual tax liability. The attempt at an answer I provide below is from a Canadian & US context, but should be similar to how this is viewed elsewhere in the world. First note that capital gains today are much more fluid in concept than even 100 years ago. When the personal income tax was first introduced [to pay for WWI], a capital gain was viewed as a very deliberate action; the permanent sale of property. Capital gains were not taxed at all initially [in Canada until 1971], under the view that income taxes would have been paid on income-earning assets all along [through interest, dividends, and rent], and therefore taxing capital gains would be a form of 'double-taxation'. This active, permanent sale was also viewed as an action that an investor would need to work for. Therefore it was seen as foolish to prevent investors from taking positive economic action [redistributing their capital in the most effective way], simply to avoid the tax. However today, because of favourable taxation on capital gains, many financial products attempt to package and sell capital gains to investors. For example, many Canadian mutual funds buy and sell investments to earn capital gains, and distribute those capital gains to the owners of the mutual fund. This is no longer an active action taken by the investor, it is simply a function of passive investing. The line between what is a dividend and what is a capital gain has been blurred by these and similar advanced financial products. To the casual investor, there is no practical difference between receiving dividends or capital gain distributions, except for the tax impact. The notional gain realized on the sale of property includes inflation. Consider a rental property bought in 1930 for $100,000, and sold in 1960 for $180,000, assuming inflation between 1930 and 1960 was 70%. In 1960 dollars, the property was effectively bought for 170k. This means the true gain after accounting for inflation is only $10k. But, the notional gain is $80k, meaning a tax on that capital gain would be almost entirely a tax on inflation. This is viewed by many as being unfair, as it does not actually represent true income. I will pause to note that any tax on any investment at all, taxes inflation; interest, for example, is taxed in full even though it can be almost entirely inflationary, depending on economic conditions. A tax on capital gains may restrict market liquidity. A key difference between capital gains and interest/rent/dividends, is that other forms of investment income are taxed annually. If you hold a bond, you get taxed on interest from that bond. You cannot gain value from a bond, deferring tax until the date it matures [at least in Canada, you are deemed to accrue bond interest annually, even if it is a 0 coupon bond].  However, what if interest rates have gone down, increasing the value of your bond, and you want to sell it to invest in a business? You may choose not to do this, to avoid tax on that capital gain. If it were taxed as much as regular income, you might be even more inclined to never sell any asset until you absolutely have to, thus restricting the flow of capital in the market. I will pause here again, to note that laws could be enacted to minimize capital gains tax, as long as the money is reinvested immediately, thus reducing this impact.  Political inertia / lobbying from key interests has a significant impact on the tax structure for investments. The fact remains that the capital gains tax is most significantly an impact on those with accrued wealth. It would take significant public support to increase capital gain tax rates, for any political party to enact such laws. When you get right down to it, tax laws are complex, and hard to push in the public eye. The general public barely understands that their effective tax rate is far lower than their top marginal tax rate. Any tax increases at all are often viewed negatively, even by those who would never personally pay any of that tax due to lack of investment income. Therefore such changes are typically made quietly, and with some level of bi-partisan support. If you feel the capital gains tax rules are illogical, just add it to the pile of such tax laws that exist today.