TWO BIG THINGS threaten the improving U.S. economy: a weak dollar and trade protectionism. Both routinely seduce policymakers, and both always result in bitter aftermaths with terrible political consequences. Yet some in the Trump administration are playing with both—and with fire. • The dollar. Great nations do not have weak currencies. Nonetheless, with a surety born of ignorance, Treasury secretary Steven Mnuchin has bluntly stated his desire for a weak dollar.
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