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2013•Journal of the History of Economic ThoughtRequires access

PIGOU, KNIGHT, DIMINISHING RETURNS, AND OPTIMAL PIGOUVIAN CONGESTION TOLLS

John F. McDonald

Open publisher page 12 citations

Abstract

Arthur Pigou introduced the iconic two-road model in the first edition of The Economics of Welfare (1920), and it has been thought that this model was intended to demonstrate the need for Pigouvian taxes to mitigate traffic congestion. However, Pigou’s intention was to show that efficient output for industries subject to decreasing returns required a tax on output. Pigou was incorrect, but the two-road model (correctly considered) became the starting point for the analysis of traffic congestion in the 1950s. This paper recounts the doctrinal history of decreasing returns industries and the two-road model.

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What this paper is about

Arthur Pigou introduced the iconic two-road model in the first edition of The Economics of Welfare (1920), and it has been thought that this model was intended to demonstrate the need for Pigouvian taxes to mitigate traffic congestion. However, Pigou’s intention was to show that efficient output for industries subject to decreasing returns required a tax on output. Pigou was incorrect, but the two-road model (correctly considered) became the starting point for the analysis of traffic congestion in the 1950s. This paper recounts the doctrinal history of decreasing returns industries and the two-road model.

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OpenAlex reports 12 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

Arthur Pigou introduced the iconic two-road model in the first edition of The Economics of Welfare (1920), and it has been thought that this model was intended to demonstrate the need for Pigouvian taxes to mitigate traffic congestion. However, Pigou’s intention was to show that efficient output for industries subject to decreasing returns required a tax on output. Pigou was incorrect, but the two-road model (correctly considered) became the starting point for the analysis of traffic congestion in the 1950s. This paper recounts the doctrinal history of decreasing returns industries and the two-road model.

Key concepts: Pigou effect, Economics, Knight, Welfare, Point (geometry), Microeconomics, Keynesian economics, Mathematics

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