Freakonomics Radio asks this question in its latest podcast.
The answer would seem obvious: Yes, he matters. A whole lot. Absolutely.
But is that really so?
Stephen Dubner puts the question to former US Attorney General John Ashcroft, economist Justin Wolfers, Tampa Bay Rays manager Joe Maddon, “baseball economist” J.C. Bradbury, and Cornell law professor Bernadette Meyler.