# Trygve Haavelmo

##### 1911-1999

In 1989 Norwegian economist Trygve Haavelmo was awarded the Nobel Prize “for his clarification of the probability theory foundations of econometrics and his analyses of simultaneous economic structures.” He made two main contributions in econometrics. The first is a 1943 article that shows some of the statistical implications of simultaneous equations. The second is a 1944 article that bases econometrics more firmly on probability theory.

During the war years Haavelmo worked for the Norwegian government in the United States. He was a professor of economics at the University of Oslo from 1948 until his retirement in 1979.

## Selected Works

1943. “The Statistical Implications of a System of Simultaneous Equations.”

*Econometrica*11 (January): 1–12.1944. “The Probability Approach in Econometrics.” Supplement to

*Econometrica*12 (July): S1–S115.1960.

*A Study in the Theory of Investment.*Chicago: University of Chicago Press.