05/26/2008 at 01:00 AM EDT
Who has the better deal: celebs who look serious hanging with economist Jeffrey Sachs (author of Common Wealth
) or Sachs himself? Three reasons he thinks he wins:
1 HIS DO-GOODING PALS DO THEIR HOMEWORK Bono runs circles around the politicians. The smarts of these celebrities are remarkable.
2 THEY HAVE THE COMMON TOUCH You go to an African village and people don't know who Angelina is. She's just in there with people, chatting. She has incredible reach.
3 THEY SHINE A LIGHT When you have Madonna
, Brad Pitt
and John Legend leading the way, people want to get involved in changing the world.