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Our Treasury Secretary Is an Economic Illiterate – Kevin D. Williamson

When we were youngsters in the ’80s, a buddy of mine had one of those cars with a digital dashboard that seemed high-tech at the time. “Watch me hit the turbocharger,” he would say, and the speedometer would show us jumping instantly from 60 to 95. Of course, the little four-banger in that Reagan-era econobox wasn’t suddenly burning rubber around Loop 289 in Lubbock, Texas—he was just toggling between miles per hour and kilometers per hour. It was his favorite little joke: We all had crappy cars back then, as teenagers did. 

Changing the units of measure does not change the reality of the phenomenon being measured. If your employer starts paying you in Japanese yen tomorrow instead of U.S. dollars, the number on the paycheck will be about 146 times what it would have been otherwise. But you aren’t better off—you’re just measuring your income by a different metric. (You’d probably be worse off, in fact: Changing those yen into dollars you can use will entail paying a fee, because transaction costs are a thing.) The thing about inches and centimeters and miles and kilometers is that you can switch from one to the other, but an inch is always 2.54 centimeters—the exchange rate is fixed. An inch is an inch is an inch. 

But it’s different in economics, where a dollar is not always a dollar and is not always 146 yen.

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