Productivity and output have grown rapidly over many years
For example, between 1930 and 2000 U.S. agricultural output quadrupled, while USDA index of aggregate inputs (land, labour, capital and other material inputs) remained essentially unchanged.
- The percentage of U.S. disposable income spent on food prepared at home decreased from 22 percent in 1950 to 7 percent by the end of the century.
- US grain production has doubled in last 15 years (with overproduction leading to biofuels subsidies).