 Relative declines in female happiness have eroded a gender gap in happiness in which women in the 1970s typically reported higher subjective well-being than did men.In rich societies, where a rise in income doesn't equate to an increase in levels of subjective well-being, personal relationships are the determining factors of happiness.Glaeser, Gottlieb and Ziv suggest in their conclusion that the happiness trade-offs that individuals seem willing to make aligns with the tendency of parents to report less happiness, as they sacrifice their personal well-being for the "price" of having children.