Evgeny "Eugen" Evgenievich Slutsky (icon ; ; – 10 March 1948) was a Russia

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

n/Soviet mathematical statistician

Statistician

A statistician is someone who works with theoretical or applied statistics. The profession exists in both the private and public sectors. The core of that work is to measure, interpret, and describe the world and human activity patterns within it...

, economist

Economist

An economist is a professional in the social science discipline of economics. The individual may also study, develop, and apply theories and concepts from economics and write about economic policy...

 and political economist.
He is principally known for work in deriving the relationships embodied in the very well known Slutsky equation

Slutsky equation

The Slutsky equation in economics, named after Eugen Slutsky , relates changes in Marshallian demand to changes in Hicksian demand...

 which is widely used in microeconomic consumer theory

Consumer theory

Consumer choice is a theory of microeconomics that relates preferences for consumption goods and services to consumption expenditures and ultimately to consumer demand curves. The link between personal preferences, consumption, and the demand curve is one of the most closely studied relations in...

 for separating the substitution effect and the income effect of a price change on the total quantity of a good demanded following a price change in that good, or in a related good that may have a cross-price effect on the original good quantity.