> Firms that won and could hire all the foreign workers they sought saw revenue rise with an elasticity of approximately 0.20, meaning a doubling of H-2B employment raised revenue by about a fifth. Investment in equipment, vehicles, and structures responded even more strongly, with an elasticity of 1.5 to 2.1.

The "investment in equipment, vehicles, and structures" seem to be referring to Capital-labor ratio, a metric in economics that is often attributed as a good indicator of company productivity. I wonder if firms would still prefer to invest in labor force in lieu of capital, given the greater revenue multiple achieved by capital investment.

While this study pertains to US labor force, it is also salient to the Japanese economy. Here in Japan, we have a shrinking working population. Firms have responded by importing labor from abroad and investing in capital (e.g. automation). For example, convenience stores would hire foreigners, but eventually reduce headcount when they install self-serviced checkout.