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: "We must comprehend that it is impossible to improve the economic conditions of the underdeveloped nations by grants in aid. If we send them foodstuffs to fight famines, we merely relieve their governments from the necessity of abandoning their disastrous agricultural policies." - Money, Method, and the Market Process