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<p>Physics and Economics). This topic was suggested by Ehrenfest and allowed Tinbergen to combine his interests in mathematics, physics, economics and politics. At that time, CBS established a new department of business surveys and mathematical statistics, and Tinbergen became its first chairman, working at CBS until 1945. Access to the vast CBS data helped Tinbergen in testing his theoretical models. In parallel, starting from 1931, he was professor of statistics at the <a href="page.php?w=University_of_Amsterdam">University of Amsterdam</a>, and</p><p>
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