The American founders understood that people would have more say over their government the closer it was to them, which is why the United States was set up as a federal republic. Under the Constitution, the federal government has few powers, and state and local governments have many powers if the people so choose. The power to tax is one of the most coercive powers governments have, so it is extremely dangerous to both liberty and prosperity.

Think of the consequences if international organizations gain the ability to tax. The tax-exempt bureaucrats who run these organizations will have an endless list of "unmet needs" and thus will create reasons to have never-ending tax increases. The United Nations is pushing a global financial transactions tax "to offset the costs of the enduring economic, financial, fuel, climate and food crises, and to protect basic human rights."

James Hansen of NASA again recently proposed a "flat-rate global tax" on carbon to stop global warming. In 2009, then-House Speaker Nancy Pelosi expressed her support for a Group of 20 "global tax." In March, Vice President Joseph R. Biden said, "We want to create a global minimum tax." It goes on and on.

In sum, the global-tax advocates are demanding that the world's most productive people and institutions give more money to global, nondemocratic institutions, which have been rife with mismanagement and corruption, so those within the global institutions can spend it as they see fit with virtually no accountability. The resulting misallocation of capital will make the world dirtier and poorer, with higher unemployment.

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