I genuinely believe that relationships with family and close friends are one of the greatest sources of happiness in life. It sounds simple, but like any important investment, these relationships need consistent attention and care. But there are two forces that will be constantly working against this happening. First, you'll be routinely tempted to invest your resources elsewhere--in things that will provide you with a more immediate payoff. And second, your family and friends rarely shout the loudest to demand your attention. They love you and they want to support your career, too. That can add up to neglecting the people you care about most in the world. The theory of good money, bad money explains that the clock of building a fulfilling relationship is ticking from the start. If you don't nurture and develop those relationships, they won't be there to support you if you find yourself traversing some of the more challenging stretches of life, or as one of the most important sources of happiness in your life.