The idea of bunking with a roommate just seemed immature to Dan. As a forty-year-old man with a family, Dan believed he was far too old and past the point in his life when he should even consider living with some stranger. He had scoffed when his wife proposed the idea to him. “A roommate? Jesus, Sarah, I’m forty years old,” he said, half laughing. “I’m not in college anymore.” Like most American families, the economic do...