Remember that I began by distinguishing between happiness and life satisfaction. Happiness is just one component of the broader, longer-term concept of life satisfaction, and only one indicator of how the fabric of our lives is being shaped by our choices and circumstances. I am reminded of a story about Abraham Lincoln.
According to the story, Lincoln was riding with a friend in a carriage on a rainy evening. As they rode, Lincoln told the friend that he believed in what economists would call the utility-maximizing theory of behavior, that people always act so as to maximize their own happiness, and for no other reason.