"The advance in knowledge and useful new factors based on such knowledge are all too frequently put aside as if they were not produced means of production but instead simply happened to occur over time. This view is as a rule implicit in the notion of technological change."

“Economists have long known that people are an important part of the wealth of nations.”

“The dominant social thought shapes the institutionalized order of society... and the malfunctioning of established institutions in turn alters social thought.”

“Although it is obvious that people acquire useful skills and knowledge, it is not obvious that these skills and knowledge are a form of capital, that this capital is in substantial part a product of deliberate investment, that it has grown in Western societies at a much faster rate than conventional capital, and that this growth may well be the most distinctive feature of the economic system.”

“Nobelprize.org: Autobiography”

“New York Times: Theodore Schultz, 95, Winner Of a Key Prize in Economics”

“efficient but poor hypothesis... that the combination of crops grown, the number of times and depth of cultivation, the time of planting, watering, and harvesting, the combination of hand tools, ditches to carry water to the fields, draft animals and simple equipment -- are all made with a fine regard for marginal costs.”