The Algebra of Happiness: Notes on the Pursuit of Success, Love, and Meaning

by Scott Galloway

Always be in the stock market, because you aren’t smart enough to predict when to jump in and out on your own. Try not to have more than one-third of your assets in any one asset class when you’re younger than forty, and lower that to 15 percent when you’re older than forty.

By the time you’re thirty, you should have a feel for what your burn is. Young people are 100 percent focused on their earnings. Adults also focus on their burn.