<P> (1) Use mathematics as shorthand language, rather than as an engine of inquiry . (2) Keep to them till you have done . (3) Translate into English . (4) Then illustrate by examples that are important in real life (5) Burn the mathematics. (6) If you can't succeed in 4, burn 3 . This I do often ." </P> <P> Marshall had been Mary Paley's professor of political economy at Cambridge and the two were married in 1877, forcing Marshall to leave his position as a Fellow of St John's College, Cambridge to comply with celibacy rules at the university . He became the first principal at University College, Bristol, which was the institution that later became the University of Bristol, again lecturing on political economy and economics . He perfected his Economics of Industry while at Bristol, and published it more widely in England as an economic curriculum; its simple form stood upon sophisticated theoretical foundations . Marshall achieved a measure of fame from this work, and upon the death of William Jevons in 1882, Marshall became the leading British economist of the scientific school of his time . </P> <P> Marshall returned to Cambridge, via a brief period at Balliol College, Oxford during 1883--4, to take the seat as Professor of Political Economy in 1884 on the death of Henry Fawcett . At Cambridge he endeavoured to create a new tripos for economics, a goal which he would only achieve in 1903 . Until that time, economics was taught under the Historical and Moral Sciences Triposes which failed to provide Marshall the kind of energetic and specialised students he desired . </P> <P> Marshall began his economic work, the Principles of Economics, in 1881, and spent much of the next decade at work on the treatise . His plan for the work gradually extended to a two - volume compilation on the whole of economic thought . The first volume was published in 1890 to worldwide acclaim, establishing him as one of the leading economists of his time . The second volume, which was to address foreign trade, money, trade fluctuations, taxation, and collectivism, was never published . </P>

Economic theory of consumer behaviour by alfred marshall