A well-known study by the economists Eli Berman and Linda T.M. Bui of Boston University looked at the aftermath of new regulations governing air quality in Los Angeles. The South Coast Air Quality Management District in Los Angeles enacted some of the country’s most stringent air quality standards in the 1980s, and Berman and Bui compared Los Angeles firms with those in Louisiana and Texas to see if the more regulated firms cut jobs as a result. They found that the local air quality regulations were not responsible for a large decline in employment, and that the regulations might have actually increased labor demand since firms need to hire people to help them deal with the new regulations. They argued that because all firms in a region were affected by the same regulations, they were still able to compete against one another while facing the same costs. “We find no evidence that local air quality regulation substantially reduced employment,” they concluded.