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Testing the Superstar Firm Hypothesis

Discussion Papers 1849, 21 S.

Alexander Schiersch, Caroline Stiel


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The superstar firms model provides a compelling explanation for two simultaneously occurring phenomena: the rise of concentration in industries and the fall of labor shares. Our empirical analysis confirms two of the underlying assumptions of the model: the market share increases and the labor share decreases with increasing firm-level total factor productivity, providing support for the superstar firms’ hypothesis. However, we find no evidence for the underlying mechanism of the model, the distribution of fixed labor costs. Instead, we observe increasing returns to scale that also explain lower labor shares of larger firms.

Caroline Stiel

Research Associate in the Entrepreneurship Department

Alexander Schiersch

Research Associate in the Firms and Markets Department

JEL-Classification: D24;E20;L11
Keywords: superstar firms, total factor productivity, labor share, market share, firm size
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