It's entirely arbitrary to treat differential rates for different levels of income as a structural feature of the tax code but differential rates for different types of income as a tax expenditure.

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The government has long used the Code to promote certain types of economic behavior.

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But Chrome's security will depend on how often and what types of bugs can be found in its code, says Ullrich.

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The deal also let EU airlines operate flights between the US and other non-EU countries, and made it easier for airlines to enter into code sharing agreements and other types of alliances.

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For instance, BrightScope allows a consumer to look up a financial advisor by zip code, employer, the amount of money they manage and the types of clients they cater to.

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By eliminating the preference afforded these two types of investment income, Bowles and Simpson believed they could retain the progressivity of the current tax code.

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