SUPPLY TO A FIRM: The range of quantities of a factor that a firm is able to buy at a range of factor prices. Supply to a firm is a phrase that's most relevant to the study of factor markets, especially when contrasted with supply by a firm. Supply to a firm puts the firm on the buying side of the factor market. Supply by a firm puts the firm on the selling side of the factor market. See also | supply | factor markets | supply by a firm | circular flow | factors of production |