'Supply and demand' definitions:

Definition of 'Supply and demand'

From: GCIDE

Supply \Sup*ply"\, n.; pl. Supplies.
1. The act of supplying; supplial. --A. Tucker. [1913 Webster]
2. That which supplies a want; sufficiency of things for use or want. Specifically: [1913 Webster] (a) Auxiliary troops or reenforcements. "My promised supply of horsemen." --Shak. [1913 Webster] (b) The food, and the like, which meets the daily necessities of an army or other large body of men; store; -- used chiefly in the plural; as, the army was discontented for lack of supplies. [1913 Webster] (c) An amount of money provided, as by Parliament or Congress, to meet the annual national expenditures; generally in the plural; as, to vote supplies. [1913 Webster] (d) A person who fills a place for a time; one who supplies the place of another; a substitute; esp., a clergyman who supplies a vacant pulpit. [1913 Webster]
Stated supply (Eccl.), a clergyman employed to supply a pulpit for a definite time, but not settled as a pastor. [U.S.]
Supply and demand. (Polit. Econ.) "Demand means the quantity of a given article which would be taken at a given price. Supply means the quantity of that article which could be had at that price." --F. A. Walker. [1913 Webster]