Example for automobiles
Technology – Computerized manufacturing lowers production costs and increases supply.
Input prices – A reduction in the wage paid to autoworkers lowers production costs and increases supply.
Prices of related goods – If truck prices fall, the supply cars rises.
Government policy – Removing quotas and tariffs on imported automobiles increases total automobile suppy.
Special influences - Internet shopping and auction allow consumers to compare the prices of different dealers more easily and drive high-cost seller out of business