Production functions are a central component in a variety of economic analyses. However, these production functions often first need to be estimated using data on individual production units. There is reason to believe that, more than any other input in the production process, there are severe...

We separately observe variable input expenditure and expenditure on fixed inputs in novel firm-level data covering the Belgian manufacturing sector over the last decades. This permits a deeper investigation of two potential drivers of the globally observed widening gap between firms' revenue and...