Damon Binder on how robots could reverse one of democracy’s biggest historical advantages: free people are productive, but robots don’t need freedom. "What's the reason that democratic countries are so powerful today? If you just let people be free and produce what they want, it turns out they produce more and they produce better. That's a great historical coincidence, and it wasn't true in 1200, when the best way to get military power was to brutally extract stuff from peasants." "It won't…