 Ms. Scheinbaum will have to understand that today, the Mexican economy depends much, much more on the U.S. than it did six years ago. Roughly 40% of the Mexican economy is exports, most of which go to the United States. The depreciated peso will make Mexico's exports to the U.S. cheaper, but it'll also make Mexico's imports from the U.S. more expensive. And that's where Mexican energy policy may really take a toll.