This branch of economics has suffered from several intellectual mistakes. The major mistake has been the presumption that standard economic theory is… - Theodore Schultz

The adverse economic events following the First World War turned me toward economics... I learned during my youth how hard it was for farm families to stay solvent. Farm product prices fell abruptly by more than half. Banks went bankrupt and many farmers suffered foreclosures. Was politics or economics to blame? I opted for economics.

Most people in the world are poor. If we knew the economy of being poor, we would know much of the economics that really matter. Most of the world's poor people earn their living in agriculture. If we knew the economics of agriculture, we would know much of the economic of being poor.

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.