This dissertation aims to shed light on how the institution of marriage has evolved in the United States over the last 60 years. In the first chapter, joint work with Alfred Galichon and Marion Goussé, we extend Gary Becker’s equilibrium model of marriage and the family to analyze same-sex marriage and develop an econometric method to study sorting patterns among same-sex couples. We discuss differences in the gains from marriage between same-sex and different-sex couples using a sample of Californian households for the period from 2008 to 2012. In the second chapter, joint work with Simon Weber, we describe mating patterns in the United States from 1964 to 2017 and measure the impact of changes in marital preferences on between-household i...