GO TO ANY American highschool holding an election for sophistication president and inevitably one candidate will craft an agenda of alluring guarantees—free pizza at lunch, limitless recess after—properly past their capability to really flip them into actuality. The identical impulse animates the newest economic-policy speeches delivered by Kamala Harris and Donald Trump in battleground states. Their competing visions supply utopia with out trade-offs—economics with out the economising—by which spending is greater, taxes are decrease, deficits are unimportant, inflation is licked, jobs are protected and progress is excessive.