Photos: 2 Americans win Nobel Prize in economics

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PRINCETON, N.J. (AP) — Christopher Sims and Thomas Sargent have no simple solutions to the global economic crisis. But the work that won them the Nobel Prize in economics Monday is guiding central bankers and policymakers in their search for answers.

The two Americans, both 68, were honored for their research in the 1970s and `80s on the cause-and-effect relationship between the economy and government policy.

Sims is a professor at Princeton University. Sargent teaches at New York University and is a visiting professor at Princeton.

Among their achievements, the two Nobel laureates - working separately for the most part over the years - devised tools to analyze how changes in interest rates and taxes affect growth and inflation.