A recent study by the French National Institute of Demographic Studies reveals that French couples where women earn more are at a significantly higher risk of splitting up.

The so-called “female-breadwinner penalty” seems to persist across the board – marriages, civil partnerships, even cohabiting couples.

When wives contribute significantly more (65-75%) to household income, the likelihood of divorce spikes by 20% compared to the average. But for those couples where wives earn between 10% and 15%...