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Christopher Sims

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Christopher Sims is an American economist at Princeton who shared the 2011 Nobel Prize for developing vector autoregression (VAR) methods, enabling empirical analysis of how economic shocks propagate over time.

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What is a vector autoregression in Christopher Sims's work?

A vector autoregression treats several time-series variables as jointly determined by their own past values. Instead of imposing a large economic model at the outset, researchers can study how variables such as output, inflation, and interest rates move together.

What does an impulse response show in a Sims-style VAR?

An impulse-response function traces how variables change over time after an identified economic shock. For example, it can display the estimated path of inflation and output following an unexpected monetary-policy tightening.

Why did Christopher Sims share the 2011 Nobel Prize?

Sims shared the prize with Thomas Sargent for empirical research on cause and effect in macroeconomics. Sims was recognized particularly for methods that analyze how unexpected shocks affect the economy over time.

Why did Sims criticize traditional large macroeconomic models?

Sims argued in his 1980 paper Macroeconomics and Reality that many conventional models imposed theoretically convenient restrictions that were not credible. VAR methods offered a more systematic way to let observed time-series relationships inform the analysis.

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