From the New Yorker, John Cassidy on Bernie Sanders and the case for a new economic-stimulus package. Justin Wolfers on uncovering the bad math (or logic) of an economic analysis embraced by Bernie Sanders. Has the mainstream Democratic Party become too pessimistic about the possibility of boosting economic growth? That’s the more interesting question sparked by economist Gerald Friedman’s analysis suggesting that Bernie Sanders’s economic agenda, if fully enacted, would lead to 5.3 percent annual GDP growth. Who’s winning the great Bernie magic-math battle? Annie Lowrey investigates. Professor Frances Fox Piven describes Sanders: You could call him a New Deal Democrat. Paul Krugman on the cases for public investment. Economists on candidates’ proposals: Mostly bad. Ezra Klein and Jeff Stein on how we’ve lost sight of how wildly irresponsible the Republican tax plans are.