Commentary: How to prevent the next Wall Street crisis

By Joseph Stiglitz
Special to CNN

Editor's note: Joseph E. Stiglitz, professor at Columbia University, was awarded the Nobel Prize in Economics in 2001 for his work on the economics of information and was on the climate change panel that shared the Nobel Peace Prize in 2008. Stiglitz, a supporter of Barack Obama, was a member and later chairman of the Council of Economic Advisers during the Clinton administration before joining the World Bank as chief economist and senior vice president. He is the co-author with Linda Bilmes of the "Three Trillion Dollar War: The True Costs of the Iraq Conflict."

NEW YORK (CNN) -- Many seem taken aback by the depth and severity of the current financial turmoil. I was among several economists who saw it coming and warned about the risks.

There is ample blame to be shared; but the purpose of parsing out blame is to figure out how to make a recurrence less likely.