According to a new study by Wharton professors Betsey Stevenson and Justin Wolfers, marriage and divorce rates in the United States are both at historic lows. When Stevenson and Wolfers began to analyse the changing market forces behind these new statistics, one thing became clear: The same forces that play a role in marriage and divorce statistics -- namely birth control, partial closing of the gender wage gap, the rising age of first marriages and dramatic changes in home technologies -- have also had a significant impact on businesses and employees.