Those who cite classical economics to discredit “open borders” forget Say’s Law and half of Supply-and-Demand — Rampant immigration, President Donald Trump charged in his January 8 national address, “drives down jobs and wages.” That’s become a familiar refrain. Supposedly, as they expand the supply of potential laborers competing for jobs, impoverished immigrants will seek employment at ever-lower wages. This, we are told, will impose upon native-born…