Barack Obama thought a 28 percent corporate tax rate is about right. House Republicans think 20 percent would make America competitive again. Donald Trump thinks a 15 percent rate would Make America Great Again. And for comparison, Britain’s prime minister Theresa May thinks 17 percent would make a Brexited UK both competitive and great again. Ireland prefers 12.5 percent, to the consternation of its high-taxing fellow-members of the EU.

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