Imagine a small concert venue, hosting 900 people, give or take. That’s about the number of passengers and crew on a small cruise ship, or of students attending the average U.S. public high school. A group that size collectively holds more wealth than the bottom half of the country combined, because that’s roughly how many billionaires live in the U.S. But a new bill is asking the people in that hypothetical cruise ship, concert venue, or high school to chip in, and to bankroll multi-thousand-dollar checks for millions of middle-class Americans. Sen. Bernie Sanders and Rep. Ro Khanna introduced the...