The United States has more guns than people, and one of the world's highest rates of gun homicide. What's really driving America's appalling murder rate? Is it bad people, poverty, or something else? Jens Ludwig, a professor at the Harris School of Public Policy, and Director of the University of Chicago's Crime Lab, talks to us about his new book, Unforgiving Places: The Unexpected Origins of American Gun Violence. Ludwig thinks America's failure to tackle gun violence stem from a fundamental misunderstanding about what causes it in the first place. This is the first of two episodes with Ludwig about his book.