We need banks and financiers and entrepreneurs to take risks because that's how economies grow over time.

That's how you live. You participate. You take risks.

Mr. Soros, the chairman of Soros Fund Management, is best-known as a speculator, philanthropist and political activist. He made a fortune by doing things such as betting against Britain's currency in 1992 and Thailand's in 1997. A Hungarian refugee, he has spent millions to promote democracy and learning in post-Soviet nations.

Research by James Poterba at the Massachusetts Institute of Technology finds that the wealth of the U.S.'s elderly is highly skewed. About half of retirees have little or no financial wealth when they retire and depend almost entirely on Social Security for their income.

It [economics] facilitates our understanding of the well-being of societies and the challenges they face; it explains many of the daily interactions between individuals, companies and governments, and it offers a guide to understanding political and social trends that are shaping our world.

We don't grow unless we take risks. Any successful company is riddled with failures.