Product Productivity Science

“Process productivity”, is the standard concept of productivity  modeled in the literature.

The second one is “product productivity”, defined as firms' ability to develop high-quality products spending small fixed outlays.

Journal of International Economics
Volume 91, Issue 1, September 2013, Pages 53-67

Product and process productivity: Implications for quality choice and conditional exporter premia

Juan CarlosHallak,  JagadeeshSivadasan 

https://www.sciencedirect.com/science/article/abs/pii/S0022199613000500


The pioneer of product productivity science and engineering is L.D. Miles