14.1 Competitive Factor Markets Derived demand-Demand for an input that depends on, and is derived from,both the firm's level of output and the cost of inputs. ▣Marginal revenue product(边际收益产出)-Additional revenue resulting from the sale of output created by the use of one additional unit of an input.14.1 Competitive Factor Markets  Derived demand - Demand for an input that depends on, and is derived from, both the firm’s level of output and the cost of inputs.  Marginal revenue product(边际收益产出)-Additional revenue resulting from the sale of output created by the use of one additional unit of an input