[3] He was allowed to resume studies in the Russian Empire in 1905 where he enrolled in department of law at Kiev University where he sought to apply mathematics in economics research.

He is less well known by Western economists than some of his contemporaries, due to his own changing intellectual interests as well as external factors forced upon him after the Bolshevik Revolution in 1917.

[4] Paul Samuelson noted that until 1936, he had been entirely unaware of Slutsky's 1915 "masterpiece" due to World War I and the paper's Italian language publication.

[6] This showed that it was possible for apparently cyclic behaviour to emerge as the result of random shocks to the economy if the latter were modelled using a stable stochastic difference equation with certain technical properties.

[7] This opened up a new approach to business cycle theory by hypothesising that the interaction of chance events could generate periodicity when none existed initially.