Sifting through the debris of today’s financial crisis, leading economist Andrew W. Lo of MIT Sloan says that Keynes’s “animal spirits” are as important a market force as ever. So will we be able to head off the next crisis?

Harvard Business School professor Clayton Christensen—a leading expert on disruptive innovation—discusses the environment for innovation.

• Read Christensen and coauthors on “Finding the Right Job for Your Product” and “Institutionalizing Innovation.”
• MIT World video of Christensen on disruptive innovation and health care.
• Visit his Web site, which lists recent
  news and articles.