Marginal return This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Marginal return" – news · newspapers · books · scholar · JSTOR (April 2016) (Learn how and when to remove this message) Marginal Return is the rate of return for a marginal increase in investment; roughly, this is the additional output resulting from a one-unit increase in the use of a variable input, while other inputs are constant. See also[edit] Diminishing returns Returns (economics) This economics-related article is a stub. You can help Wikipedia by expanding it.vte