Why marginal revenue product (MRP) matters to a first-time founder
The measure helps a founder ask whether another worker, machine hour or advertising unit is likely to add enough revenue to justify its cost. Returns often decline as more of one input is added while other capacity remains fixed.
Examples of marginal revenue product (MRP)
A bakery adds one four-hour shift costing £70. The extra labour produces 40 saleable loaves, and each adds £2.50 of marginal revenue, giving an MRP of £100 for the shift. Other incremental costs still matter before the shift is approved.
Common misunderstanding
It is not the same as physical productivity or the MRP abbreviation used for material requirements planning. Marginal revenue product converts additional output into revenue. It does not by itself show profit because wages, materials and other added costs remain.
When to use it
Use it for a focused hiring or capacity decision when extra output and marginal revenue can be estimated credibly. Compare it with the full incremental input cost and test uncertainty. Avoid false precision where output depends heavily on team interactions or long-term learning.