Christopher A. Sims, the Nobel Prize-winning economist who revolutionized how policymakers analyze economic data, has died at 83 from injuries sustained in a fall at his Minneapolis home. Sims, who shared the 2011 Nobel Prize with Thomas Sargent, developed sophisticated statistical models that transformed economic policymaking during periods of uncertainty and inflation.

Sims' work at Princeton and other institutions focused on vector autoregression, a technique that clarified how policy decisions affect the economy versus other factors like oil prices or consumer behavior. His research emerged during the 1970s stagflation crisis when traditional economic theories failed to explain why inflation and unemployment rose simultaneously. The Nobel Foundation recognized their empirical research on cause and effect in the macroeconomy.

Though his models improved economic forecasting, Sims acknowledged their limitations, particularly during the 2008-2009 financial crisis when few economists predicted the downturn. He also contributed to the fiscal theory of the price level, emphasizing how monetary and fiscal policies can work at cross purposes. Sims is survived by his wife, three children, four grandchildren, and siblings. His death marks the passing of a scholar who helped economists move beyond simplistic theories to data-driven analysis of complex economic systems.