1. The amount of a good or service offered for sale. The supply function relates supply to the factors which determine its level. These include the price of the good, the prices of factor services and intermediate products employed in producing it, the number of firms engaged in producing it, and their levels of capital equipment. See also adverse supply shock; aggregate supply; elasticity of supply; inelastic supply; joint supply; labour supply; money supply; refusal to supply.

2. The act of providing a good or service.