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: "In relation to the immense sacrifices that the state demands of the individual through the blood tax, it seems rather incidental whether it compensates the soldier more or less abundantly for the loss of time that he suffers from his military-service obligation." - Nation, State, and Economy