From heartstrings to purse strings, online dating has changed the way we think about love and culture, but what if it's also changing the way we think about money? A recent paper from researchers at the Federal Reserve Banks of Dallas and St. Louis and Haverford College found that online dating may have contributed to an uptick in income inequality in the U.S. over recent decades as an increasing number of people swipe left on potential mates who don't meet their criteria in select...