Each unhappy couple is unhappy in its own way—but at least part of that unhappiness may be related to women’s professional success.

A new study by Swedish researchers found that women who begin their marriage either earning less than their husband or not working at all, are significantly more likely to get divorced if their career suddenly surges.

The 2018 white paper, by Uppsala University political scientist Olle Folke and Stockholm University economist Johanna Rickne, is based “on 30 years of detailed Swedish register data that follows job candidates before and after promotions,” the authors write. While most of the analysis relates to jobs in the public sector—mayors and parliamentarians—the researchers also look at women who are promoted to CEO roles at private companies.

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