Marginal Revenue Product (MRP)
Plain definition
Marginal revenue product is the extra revenue a firm gains from hiring one more unit of a factor, calculated as marginal product times marginal revenue (MR x MP).
In economics
MRP is the firm's factor demand curve: a profit-maximizing firm hires up to the point where MRP equals the marginal cost of the factor (for labor, the wage). In perfect competition, marginal revenue equals price, so MRP = P x MP.
Example
If a 10th barista adds 40 cups per day (MP) sold at 120 per day; the shop hires them if the daily wage is below $120.
Common confusion
MRP is often confused with marginal product (MP): MP measures extra physical output, while MRP converts that output into extra revenue using price.