This paper analyzes the distribution of firm-level employment and the firm-level employment growth along two margins: the extensive margin (the number of establishments in a firm) and the intensive margin (the number of workers per establishment in a firm). We utilize administrative datasets to document the behavior of these two margins in relation to changes in the U.S. firm size distribution. In the cross section, we find that the number of establishments per firm is distributed with a fat tail, as well as the distribution of the firm sizes and the distribution of the average establishment size for each firm. We observe significant increase in average firm size between 1990 and 2015 was driven primarily by an expansion along the extensive margin, particularly in very large firms. We develop a tractable general equilibrium growth model with two types of innovations: external and internal. External innovation leads to the extensive margin of firm growth and internal innovation leads to the intensive margin growth. The model generates the three fat-tailed distributions (establishment numbers, firm sizes, and establishment sizes) as observed in our data. We also estimate the model to uncover the fundamental forces that have caused the changes from 1990 to 2015. Through the lens of our model, we find that the external innovation cost became lower for the firms that are actively expanding with new establishments. Entry became more costly whereas the average quality at entry has improved. Firm growth by external innovation has become more common but it is now shorter-lived.

About the presenter’s visit

Professor Toshihiko Mukoyama will be visiting the School of Economics from 12-17 August 2019.  While here he will be using room 509 Colin Clark Building.  If you would like to meet with him or have lunch or dinner with him please contact Dr Jorge Miranda Pinto who will be his host while at The University of Queensland.  Dr Jorge Miranda Pinto can be contacted on j.mirandapinto@uq.edu.au.

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Level 6, Colin Clark building (#39)
The University of Queensland
St Lucia campus
Room 629 (Economics boardroom)