In the long run, the workings of a competitive labor market, assisted perhaps by appropriate economic policies, ensure that jobs will be created that are commensurate with the size of the labor force and the available mix of worker skills.
Thus, in the long run, factors such as population growth, education and training, labor force participation rates, and labor market institutions determine the level and composition of aggregate employment. In contrast, trade appears to have essentially no role in determining a country’s long-run employment potential.