The cumulative effect of social capital is just as powerful as the growth of your financial capital, and perhaps even more impactful. I believe that social capital is a key driver of professional success in any career pursuit, whether it is sales, technology development, academic research, or philanthropy. It is essential to have a network of well-rounded friends who not only have extensive connections, capital, and new insights, but also have the wisdom and ability to spark change. If you make friends with this group of people, you will be able to work together to truly improve the world.