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
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)?
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