Morgan Housel has written that, for him, the highest form of wealth is the ability to wake up every morning and say, “I can do whatever I want today.” Happiness is a complicated subject because everyone is different. But if there’s a common denominator in happiness — a universal fuel of joy — it’s that people want to control their lives. To be able to do what you want, when you want, with who you want, for as long as you want, is priceless.