In her latest book, "Harvard Square: A Love Story," Catherine J. Turco, an economic sociologist and professor at MIT, has a loving relationship with Harvard Square. After growing up in Cambridge, and receiving a BA in economics, MBA, and PhD from Harvard University, she moved away from the area. Upon her return, she noticed the square had changed. In this video, Turco walks us through Harvard Square, and explains why we look to our markets for stability and security, even as they inevitably evolve.