“In a contracting economy, it becomes easier to notice that the less you need, the less vulnerable you are to the ups and downs of fortune, and the more you can get done of whatever it is that you happen to want to do. That’s an uncongenial lesson at the best of times, and during times of material abundance you won’t find many people learning it. Still, in the world after abundance, it’s hard to think of a lesson that deserves more careful attention.”