I can't understand why everyone commutes at the same time of day. It would be of HUGE economic benefit if office activities were evenly distributed around the clock (and the calendar). There would never be rush-hour traffic because people came and went at all hours. Your favorite public place or activity wouldn't be crowded Saturday afternoon, because it wouldn't be Saturday for 6/7 of the population.

Yes, there would be some large costs too, but the benefits are staggering.