# Trygve Haavelmo

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**Trygve Magnus Haavelmo** (13 December 1911 – 28 July 1999) was an influential economist with main research interests centered on the fields of econometrics and economics theory.

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## Quotes[edit]

- What makes a piece of mathematical economics not only mathematics but also economics is, I believe, this: When we set up a system of theoretical relationships and use economic names for the otherwise purely theoretical variables involved, we have in mind some actual experiment, or some design of an experiment, which we could at least imagine arranging, in order to measure those quantities in real economic life that we think might obey the laws imposed on their theoretical namesakes.
- Trygve Haavelmo, "The probability approach in econometrics" in:
*Supplement to Econometrica. 12*91944), p. 5; Cited in Pearl (2012, 1-2)

- Trygve Haavelmo, "The probability approach in econometrics" in:

## Quotes about Trygve Haavelmo[edit]

- Haavelmo was the ﬁrst to recognize the capacity of economic models to guide policies. This paper describes some of the barriers that Haavelmo’s ideas have had (and still have) to overcome, and lays out a logical framework that has evolved from Haavelmo’s insight and matured into a coherent and comprehensive account of the relationships between theory, data and policy questions. The mathematical tools that emerge from this framework now enable investigators to answer complex policy and counterfactual questions using simple routines, some by mere inspection of the model’s structure.
- Judea Pearl, "Trygve Haavelmo and the emergence of causal calculus." University of California Los Angeles, Computer Science Department, CA. 2012.