What Quality Do the Most Successful People Share? True Grit

What makes a person successful? For Professor Angela Duckworth, the answer is grit, an intangible trait that motivates passion and perseverance. In a study at West Point, Duckworth found that grit mattered more for success than leadership ability, intelligence and physical fitness. Now, she hopes to introduce grit to classrooms across the country. Economics correspondent Paul Solman reports.