And a more comprehensive measure of creditworthiness, probability of default, has improved to an estimated 3.2 percent from 4.6 percent a year ago.

FORBES: Businesses Seeking Working Capital--Survey

Conventional risk involves probability that we can clearly identified and measure.

FORBES: The New Uncertainty

The two authors measure the proximity of one product to another based on the probability that a country makes both.

ECONOMIST: Economics focus: Diversity training | The