Jon Birger

It's not that he's just not that into you-it's that there aren't enough of him. And the numbers prove it. Using a combination of demographics, statistics, game theory, and number-crunching, Date-onomics tells what every single, college-educated, heterosexual, looking-for-a-partner woman needs to know: The "man deficit" is real. It's a fascinating, if sobering read, with two critical takeaways: One, it's not you. Two, knowledge is power, so here's...