The approach was fun, but has fallen out of favour
study of mankind in the ordinary business of life.” So starts Alfred Marshall’s “Principles of Economics”, a 19th-century textbook that helped create the common language economists still use today. Marshall’s contention that economics studies the “ordinary” was not a dig, but a statement of intent. The discipline was to take seriously some of the most urgent questions in human life.
During his academic career, Mr Levitt wrote papers in applied microeconomics. He was, in his own self-effacing words, “a footnote to the ‘credibility revolution’”. This refers to the use of statistical tricks, such as instrumental-variable analysis, natural experiments and regression discontinuity, which are designed to tease out causal relationships from data.
Other economists, including James Heckman, Mr Levitt’s colleague in Chicago and another Nobel prizewinner, worried about trivialisation. “Cute”, was how he described the approach in one interview. Take a paper on discrimination in the “The Weakest Link”, a game show in which contestants vote to remove other contestants depending on whether they think they are costing them money by getting questions wrong or are competition for the prize pool by getting them right .
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