This paper estimates the regional economic impact of high-skill immigration restrictions by analyzing the 2017 “Buy American, Hire American” (BAHA) policy as a quasi-experimental policy shock. By significantly tightening H-1B visa adjudication, BAHA caused new employment petition denial rates to double from 7% to 17%, while STEM-specific rejections tripled to 31%. Using a difference-indifferences framework, this study finds that states highly dependent on H-1B talent experienced a statistically significant 2.8% relative decline in value-added output. This implied a productivity loss totaling roughly $218 billion across the most affected regions. While concurrent tax cuts and deregulation likely offset the impact on employment and wages, the loss of specialized STEM expertise adversely impacted total factor productivity. These findings suggest that policies based on conventional employment metrics may overlook the “hidden damage” to productivity and innovation that drives the broader economy, thereby underestimating the true economic cost of immigration restrictions.

That is by Caroline Y. Su of McLean High School.  Via the excellent Kevin Lewis.