Responding to a question about food costs, Trump told the Michigan audience that his plan would entail both energy deregulation and protectionist restrictions on food imports, which, he claims, would help American farmers. As a plan to lower grocery prices, however, Trump’s protectionism is ludicrous. If implemented, it could even return us to the bad old days of American grocery scarcity. As anyone over the age of 40 can attest, American grocery stores weren’t always the global fantasylands they are today. Trump’s plan to restrict food imports could drag us back to that era.