Philip Wicksteed, English philosopher, theologian, and economist, made important advances in economic method and in the theory of marginal productivity. He also emphasized the subjectivism of costs. His use of mathematics and graphical analysis, coupled with a lively writing style, made these tools more accessible to students. He influenced many 20th century economists, particularly those working in the Austrian tradition.
Ludwig von Mises: "Monetary calculation and cost accounting constitute the most important intellectual tool of the capitalist entrepreneur, and it was no one less than Goethe who pronounced the system of double-entry bookkeeping one of the finest inventions of the human mind." - Liberalism