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Some economists suggest that all firms would be expected to pay workers doing identical jobs the same wage. However, studies show that high-profit industries tend to pay more. While some of this observed wage gap could be due to difficulties in measuring workers` talent, it is unlikely that such measurement problems can explain everything. Although talent is hard to measure, factors with which it is presumably correlated, such as education and tenure, are not. Yet studies that control for those factors still find big wage disparities. Moreover, although receptionists, for example, do not become less talented when they leave a high-profit industry to work in an industry with lower profits, their pay tends to drop in line with the wage gap between the two.