In examining the mathematical models, theories of value, and price statistics wielded by leading economist and social reformer Irving Fisher, this article explores the overlooked impact that Neoclassical Economics had on Progressive Era reform and thought. By offering a neoclassical theory of marginal utility that claimed that market prices reflected subjective value, Fisher formalized, legitimized, and popularized the use of price statistics in progressive political discourse, teaching the American people that if they wanted to argue over the nature of progress or the worthiness of a certain reform, they would have to price it first. The article argues that such a "pricing of progressivism" served as an important foundational precursor to the rise of neoliberal thought in the 1980s.In light of such a significant intellectual legacy, it seems imperative that intellectual historians of the Progressive Era turn their attention away from the usual suspects of this period, such as Pragmatists William James and John Dewey, and shift their analytical focus away from the "Metaphysical Club" and toward a neoclassical one."An eight-pound baby is worth, at birth, $362 a pound. That is a child's value as a potential wealth-producer. If he lives out the normal term of years, he can produce $2900 more wealth than it costs to rear him and maintain him as an adult. The figures with regard to earning capacity are given by Irving Fisher, Professor of Political Economy." Thus opens a page-long article in the New York Times on January 30, 1910. The title of the article was "What the Baby is Worth as a National Asset: Last Year's Crop Reached a Value Estimated at $6.96 Billion." 1 While talk of baby crops and their price per pound was a bit extreme for the Progressive Era, the money valuation of varying aspects of everyday American life was far from uncommon. 2 It is also not unusual that the author of this piece got his price data from Yale economist Irving Fisher. Praised by Joseph Schumpeter as "the greatest economist the United States ever produced" and remembered fondly today by both liberal and conservative economists as the founding father of modern-day, mathematical "neoclassical" economics and monetarist theory, Fisher was also a serial progressive reformer and a walking statistical repository who rarely met a social problem he did not price. 3 While largely overlooked by historians of the Progressive Era-perhaps because he did not fit their preconceived notion of what a progressive reformer should be-Fisher was tremendously influential and a well-known figure in his day. As a New York