Are Female Workers Less Productive Than Male Workers? — Trond Petersen, Vemund Snartland, and Eva M. Meyersson Milgrom (2007).

This study examines whether the gender wage gap reflects differences in productivity or discrimination.

Using data from more than one million blue-collar workers in the United States, Norway, and Sweden, the authors compare wages under piece-rate and time-rate pay systems.

1. Productivity Differences Exist but Are Very Small

2. Most of the Gender Wage Gap Cannot Be Explained by Productivity Alone

3. Family Responsibilities Affect Earnings

4. Productivity Advantages Depend on the Type of Work

5. The Study Challenges Simple Explanations

🧠 Conclusion

The paper’s central finding is that women are not substantially less productive than men in comparable blue-collar jobs. ⭐

Across more than one million workers in the United States, Norway, and Sweden, the measured productivity gap was only about 1–3%, far smaller than the overall gender wage gap. ⭐

The authors therefore challenge the idea that women’s lower earnings can be explained primarily by lower productivity. ⭐

At the same time, they stop short of claiming that discrimination explains everything. Instead, the evidence points to a more complex picture involving productivity, family responsibilities, occupational differences, workplace structures, and possible discrimination.

The study’s broader contribution is showing how empirical data can test assumptions that are often treated as common sense but may not withstand careful measurement.