Ten years ago this week, the world fell into the worst financial crisis in almost a century when the fourth-biggest U.S. investment bank, Lehman Brothers, declared bankruptcy.

Ten years ago this week, the world fell into the worst financial crisis in almost a century when the fourth-biggest U.S. investment bank, Lehman Brothers, declared bankruptcy. A decade later, some experts caution that the world is in even greater danger. Though banks are safer and more resilient now, companies have increased their debt levels. Moreover, risky financial products similar to the ones that brought down the global economy are on the upswing at shadow banking institutions.