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Marshallian surplus

Marshallian surplus

Overview
In economics
Economics
Economics is the social science that studies the production, distribution, and consumption of goods and services. The term economics comes from the Ancient Greek from + , hence "rules of the house"...

, marshallian surplus, is the idea that economic welfare
Welfare economics
Welfare economics is a branch of economics that uses microeconomic techniques to simultaneously determine allocative efficiency within an economy and the income distribution associated with it. It analyzes social welfare, however measured, in terms of economic activities of the individuals that...

 is divided into producer surplus and consumer surplus. It was named after Alfred Marshall
Alfred Marshall
Alfred Marshall was an English economist and one of the most influential economists of his time, being one of the founders of neoclassical economics...

.
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Encyclopedia
In economics
Economics
Economics is the social science that studies the production, distribution, and consumption of goods and services. The term economics comes from the Ancient Greek from + , hence "rules of the house"...

, marshallian surplus, is the idea that economic welfare
Welfare economics
Welfare economics is a branch of economics that uses microeconomic techniques to simultaneously determine allocative efficiency within an economy and the income distribution associated with it. It analyzes social welfare, however measured, in terms of economic activities of the individuals that...

 is divided into producer surplus and consumer surplus. It was named after Alfred Marshall
Alfred Marshall
Alfred Marshall was an English economist and one of the most influential economists of his time, being one of the founders of neoclassical economics...

.

Consumer surplus is the willingness to pay over and above what they have to pay. It is near impossible to measure individual change in utility for every price change, so estimates are used. One such estimate is using the Marshallian Consumer Surplus method.