Haavelmo memulai kariernya sebagai murid Ragnar Anton Kittil Frisch di Universitas Oslo. Ia mendapatkan gelar doktor dalam ilmu ekonomi pada tahun 1946. Ia adalah seorang staf di Departemen Perdagangan dari tahun 1947 hingga 1948 dan juga profesor dalam bidang ekonomi masyarakat dan statistik di Universitetet i Oslo antara tahun 1948–1979.
"The Method of Supplementary Confluent Relations", 1938, Econometrica
"The Inadequacy of Testing Dynamic Theory by Comparing the Theoretical Solutions and Observed Cycles", 1940, Econometrica
"Statistical Testing of Business Cycles", 1943, RES
"The Statistical Implications of a System of Simultaneous Equations", 1943, Econometrica
"The Probability Approach in Econometrics", 1944, Econometrica
"Multiplier Effects of a Balanced Budget", 1945, Econometrica ("Supp. Notes", 1946)
"Family Expenditures and the Marginal Propensity to Consume", 1947, Econometrica
"Methods of Measuring the Marginal Propensity to Consume", 1947, JASA
"Statistical Analysis of the Demand for Food: Examples of Simultaneous Estimation of Structural Equations", with M.A. Girshick, 1947, Econometrica
"Family Expenditures and the Marginal Propensity to Consume", 1947, Econometrica
"Quantitative Research in Agricultural Economics: The Interdependence Between Agriculture and the National Economy", 1947, J of Farm Econ
"The Notion of Involuntary Economic Decisions",1949, EJ
"A Note on the Theory of Investment", 1950, RES
"The Concepts of Modern Theories of Inflation", 1951, Eknomisk Tidssk
A Study in the Theory of Economic Evolution, 1954.
"The Role of the Econometrician in the Advancement of Economic Theory", 1958, Econometrica
