Here’s the roadmap for winning an American election

Ah, election season. That festive time when politicians suddenly have new ideas about how to make our lives better. This year the limelight shines brightly on our revered American economy, which is presently either good or bad, depending on whom you ask. But it’s election season, so voters rule and the experts can take a powder. And that’s why today we have both presidential candidates proposing economic policies that make economists wince and voters cheer.

The remarkable gap between experts...