This paper examines the experiment in macroeconometrics, the different forms it has taken and the rules that have been proposed for its proper conduct. Here an 'experiment' means putting a question to a model and getting an answer. Different types of experiment are distinguished and the justification that can be provided for a particular choice of experiment is discussed. Three types of macroeconometric modelling are considered: the Cowles (system of equations) approach, the vector autoregressive model approach and the computational experiment. JEL Classifications: B41, C5, E37
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