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High-income countries are experiencing both unprecedentedly low and increasingly polarized fertility with growing social gradients in childbearing. Key theories on fertility patterns are based on the empirical observation that until recently fertility remained comparatively high in gender-egalitarian countries with strong support for families. Since 2010 many of the countries that provided evidence for such theories have reached record-low fertility. This confronts the scientific paradigm of the key drivers of fertility. Detailed Description