Go ahead, let it soak in: Thirteen trillion, fifty billion, eight hundred twenty-six million, four hundred sixty thousand, eight hundred eighty-six dollars . . . and ninety-seven cents. Seen on the “debt clock” in Times Square, that number seems little more than an abstraction, something almost impossible to process. But think about it this way: If you earned one dollar every second, it would take you 416,000 years to earn enough money to pay it off. Or consider: Alex Rodriguez earned $33 million last year, making him the highest paid player in baseball. It would take nearly 400,000 Rodriguezes to...