[Y]our letter concerning my paper... has told me much... concerning the ideas current in philosophical subjects in Cambridge. I was not aware that Marshall had so long entertained notions of a quantitative theory of political economy, and think it a pity that he has so long delayed publishing something on the subject.
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About Alfred Marshall
Alfred Marshall was a 19th-century British economist. Alfred Marshall was an English economist and one of the most influential economists of his time. His book Principles of Economics (1890) was the dominant economic textbook in England for many years, and brought the ideas of supply and demand, marginal utility, and costs of production into a coherent whole, popularizing the modern neoclassical approach which dominates microeconomics to this day. Read more on Wikipedia →