Arthur Cecil Pigou

Arthur Cecil Pigou (1877–1959) was a highly influential British economist who succeeded Alfred Marshall as the Professor of Political Economy at the University of Cambridge. He held this prestigious position for over three decades, shaping the minds of a generation of British economists. He is most famous for formally establishing the field of welfare economics.

A Pigouvian tax is a fee levied on any market activity that generates negative externalities, such as industrial pollution, named after Arthur Cecil Pigou. The tax is designed to correct the market outcome by forcing the producer to internalize the external costs of their actions. This concept remains a foundational element of modern environmental economics.

Pigou is universally recognized as one of the principal founders of welfare economics, a branch that evaluates how different economic allocations affect overall well-being. He introduced the crucial distinction between private and social costs/benefits, showing how they diverge in the presence of externalities. His theories provided the intellectual justification for government intervention to improve social welfare.

Pigou directly expanded upon the foundational microeconomic theories of his predecessor and mentor, Alfred Marshall. While Marshall focused heavily on partial equilibrium and supply/demand mechanics, Pigou applied these tools specifically to the study of national welfare and externalities. Pigou's work essentially built the practical policy applications of the Marshallian theoretical framework.