Is America's cultural divide growing?

Many of us have a general sense that as a society, we're not just becoming more polarized politically, but we're also moving further apart culturally – what we buy, what we watch, how we spend our spare time - these consumer behaviors are also increasingly diverging. Chicago Booth's Emir Kamenica has studied the cultural divide in America. While his research confirms a widening gap in social attitudes between conservatives and liberals, it also reveals that the culture gap is remarkably stable. How did he arrive at that conclusion, and what does it mean for society?