Ragnar Frisch and Jan Tinbergen
Citation: For developing and applying dynamic models for the analysis of economic processes.
The key idea
Economics is a measurable science. Build dynamic equations of the economy, estimate them with data, use them to forecast and design policy.
The explanation
Frisch coined the words 'econometrics' and 'macroeconomics' and built the first impulse-propagation models — small shocks propagated through a system produce business cycles. Tinbergen built the first complete macroeconometric model of a national economy (the Netherlands, 1936) and the first model of the United States. Together they argued that economic policy must specify clear targets and equally many independent instruments — the Tinbergen Rule.
Why Africa should care
Every African central bank that publishes a forecast — CBK, SARB, Bank of Ghana, BNR — uses a descendant of Tinbergen's machinery. The Tinbergen Rule explains why countries with one instrument (a policy rate) cannot simultaneously target inflation, the exchange rate, and the output gap; they have to choose.
How to use it
Whenever a policymaker promises to fix inflation, employment, the shilling, and growth simultaneously with one instrument, count the targets vs the instruments and ask what was quietly dropped.
Watch out for
Macroeconometric models calibrated on one regime fail catastrophically in another — the Lucas critique (1995). Don't trust 30-year coefficient estimates through a structural break.
Canonical works
- Jan Tinbergen (1939) "Statistical Testing of Business-Cycle Theories" League of Nations
- Ragnar Frisch (1933) "Propagation Problems and Impulse Problems in Dynamic Economics" Economic Essays in Honour of Gustav Cassel
- Jan Tinbergen (1952) "On the Theory of Economic Policy" North-Holland
More from Foundations · 1969-1979
- 1970Paul Samuelson
Economic theory has the structure of physics: optimisation under constraints, with comparative statics and dynamic stability following from the same maximisation principles.
- 1971Simon Kuznets
Growth is structural transformation, not a single line on a chart. Inequality follows an inverted U as economies industrialise — the Kuznets curve.
- 1972Kenneth Arrow and John Hicks
When can the totality of competitive markets simultaneously clear, and when is that outcome socially efficient? Arrow-Debreu (1954) proved existence; the First Welfare Theorem proved efficiency — under restrictive assumptions.
- 1973Wassily Leontief
An economy is a matrix. Each sector produces output by buying inputs from other sectors. Once you know the matrix of inter-industry flows, you can compute the total impact of any final-demand change.
- 1974Gunnar Myrdal and Friedrich Hayek
Two utterly opposite visions: Myrdal — economies are bound up with social institutions and demand activist policy; Hayek — markets coordinate dispersed knowledge in ways no planner can replicate.