"Negative wage effects of educational mismatch have become a stylized fact. Whether these are explained by differences in unobserved productivity or poor matching is still to be answered conclusively. In an empirical analysis based on data from the German Socio-Economic Panel and the International Adult Literacy Survey, a broad econometric strategy is applied to solve the problem of unobserved heterogeneity and reveal the mechanism underlying wage differences between matched and mismatched workers. Results show that wage differentials can be explained by a poor matching in the labor market, rejecting the hypothesis that mismatched workers compensate for unobserved productivity differences."

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