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With similar equipment New York and Scranton Coal company saved five or six cents per ton of coal extracted and the Hillside Coal and Iron Company saved almost $20,000 per year on the cost of mules and laborers.”…. At Green Ridge Colliery, for example, a station engineer, a motorman, and helper could run an electric locomotive that replaced six mule drivers, four boy helpers, and seventeen mules. How did the resulting energy deepening affect conventionally-defined productivity in U.S. Manufacturing? That is, how did it affect , the marginal revenue product of working capital (Equations 3.1 and 3.2)?