Goldman’s analysts found that wearing face coverings has a significant impact on coronavirus outcomes, and they suggest that a federal mask mandate would “meaningfully” increase mask usage across the country, especially in states like Florida and Texas, where masks are not currently required.

The researchers estimate that a national mandate would increase the portion of people who wearing masks by 15%, and cut the daily growth of new cases by between 0.6% and 1%.

Reducing the spread of the virus through mask-wearing, the analysts found, could be a substitute for strict lockdown measures that would otherwise shave 5%—or $1 trillion—off the U.S. GDP.