Question: What textbook was written by the economist who created the "welfare definition" of economics?

<P0-S0>  Rogge helped produce, and narrated, a documentary on Adam Smith that was funded by Liberty Fund. <P0-S1>  Rogge received his PhD in economics from Northwestern. <P0-S2>  At Wabash College, Rogge taught in the summer Institute for Professional Development, in addition to his usual teaching in economics. <P0-S3>  Rogge wrote the introduction to a collection of quotations from Adam Smith. <P0-S4>  A posthumous collection of Rogge's speeches and essays has appeared under the title "A Maverick's Defense of Freedom". <P0-S5>  Liberty Fund was founded with money from Pierre Goodrich, who sought advice from Rogge during the Fund's early years. <P0-S6>  Rogge also was a frequent presenter at the seminars of the Foundation for Economic Education (FEE). <P0-S7>  One strength of the text is the account that it gives of Joseph Schumpeter's process of creative destruction. <P0-S8>  Rogge helped organize a series of lectures by Milton Friedman at Wabash that were eventually developed into Friedman's "Capitalism and Freedom" book. <P0-S9>  An extended (but somewhat grainy) video clip of a Rogge FEE lecture on "Competition and Monopoly" on YouTube illustrates the dry wit that made him a popular speaker. <P0-S10>  Rogge's archives are mainly housed at the Hoover Institute on the campus of Stanford University. <P0-S11>  Wabash College, where he taught for many years, established a speaker series in his honor. <P0-S12>  Rogge attended 13 meetings of the influential international Mont Pelerin Society. <P0-S13>  Thomas Sowell gives Rogge credit for encouraging him to write a book on economics and race. <P0-S14>  FEE's founder, Leonard Read, thought of Rogge as Read's eventual successor, an outcome prevented by Read outliving Rogge. <SEP> <P1-S0> Julie A. Nelson (born 1956) is an American feminist economist and Professor of Economics at the University of Massachusetts Boston, most known for her application of feminist theory to questions of the definition of the discipline of economics, and its models and methodology. <P1-S1>  Nelson received her Ph.D. degree in Economics from the University of Wisconsin–Madison. <P1-S2>  Her work focuses on gender and economics, philosophy and methodology of economics, ecological economics, and quantitative methods. <P1-S3>  Nelson is among the founders and the most highly cited scholars in the field of feminist economics. <SEP> <P2-S0> The "welfare definition" of economics is an attempt by Alfred Marshall, a pioneer neoclassical economist, to redefine his field of study. <P2-S1>  This definition expands the field of economic science to a larger study of humanity. <P2-S2>  Specifically, Marshall's view is that economics studies all the actions that people take in order to achieve economic welfare. <P2-S3>  In the words of Marshall, "man earns money to get material welfare." <P2-S4>  This is why economists since Marshall have described his definition as the "welfare definition" of economics. <P2-S5>  This definition enlarged the scope of economic science by emphasizing the study of wealth and humanity together, rather than wealth alone. <SEP> <P3-S0> Alfred Marshall (26 July 1842 – 13 July 1924) was one of the most influential economists of his time. <P3-S1>  His book, "Principles of Economics" (1890), was the dominant economic textbook in England for many years. <P3-S2>  It brings the ideas of supply and demand, marginal utility, and costs of production into a coherent whole. <P3-S3>  He is known as one of the founders of neoclassical economics. <P3-S4>  Although Marshall took economics to a more mathematically rigorous level, he did not want mathematics to overshadow economics and thus make economics irrelevant to the layman.