Unbalanced growth, pockmarked by financial distress. The threat of protectionism brought on by persistently high unemployment, particularly in developed countries. Tensions, in wealthy nations as well as poor ones, around ethnic, religious, and linguistic divides, and talk of a new age of secession or tribalism. These are some of the developments that contradict the story we had just gotten used to—the one about how markets were becoming perfectly integrated across borders, technology was obliterating distance, and national governments were now irrelevant. The aftermath of the financial crisis of 2008 reminds us of the many ways in which differences still matter.

A version of this article appeared in the May 2011 issue of Harvard Business Review.