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Economics, as a branch of the more general theory of human action, deals with all human action, i.e., with mans purposive aiming at the attainment of ends chosen, whatever these ends may be.--Ludwig von Mises
Taxing capital gains at a lower rate than ordinary income is a long-established policy to encourage risk taking and investment. Since we already tax corporate earnings at 35% through the corporate income tax, taxing those profits again when the stock is sold imposes a double tax on risk capital. That's why 12 industrialized nations, including Hong Kong and Korea, impose a zero capital gains rate.