Stock Market Decline; Jean-Marie Guehenno; Gail Collins

Chief global economist Stephen Roach and chief investment strategist Byron Wien debate the stock market decline in China and its effect on the world. U.N. Undersecretary General for Peacekeeping Operations Jean-Marie Guehenno discusses peace keeping missions around the world. Columnist Gail Collins examines the world of reporting and reflects on her career at The New York Times.