Do rising productivity levels raise the cost of starting new firms?
Core argument: U.S. data from 1978 to 2020 show the number of workers per firm is stable or rises with output per worker over time and across states, while the number of firms tracks total employment more closely than output per worker.
In the U.S., the number of workers per firm is stable or rises with output per worker over time and across states. This fact can be explained by a model in which entry costs rise with labor productivity. Over time and across states in the U.S., the number of firms is more closely tied to overall employment than to output per worker. In many models of firm dynamics, trade, and growth with a free entry condition, these facts imply that the costs of creating a new firm increase sharply with productivity growth. How entry costs vary with growth matters for welfare. For example, our findings suggest that productivity-enhancing policies will not induce entry of firms, thereby limiting the total impact of such policies on welfare. Figure 1 displays the result of regressing log number of firms on log employment and log employment per firm on log GDP per worker, respectively, over time. The data is yearly from 1978 to 2020. Both bilateral relationships are strongly positive both economically and statistically. These results are consistent with entry costs being more labor intensive than goods intensive.




