Last year two 20-somethings decided to sell books on the streets of New Orleans. But the city said they needed a permit. But it wasn’t possible to get a permit. “It turned out New Orleans had permits for street vendors selling food, flowers, razor blades, shoelaces, candles, and pencils—but not books. And anything that wasn’t explicitly permitted was forbidden.” So the pair fought the ban and ended up in the state Supreme Court – where they won…