Tim Worstall explains The American Social Model and how we aren’t working longer hours:
For women, paid working hours have indeed been getting longer. For men, they have been falling (although largely static for the past decade). But unpaid working hours for both men and women have been falling fast, indeed, faster than women’s paid have been rising. So total work has declined and leisure increased.
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Precisely because women are earning — and then buying in those services which they used to do unpaid — we’re seeing greater specialization of labor (or if you prefer, more trade). And as we know that’s the route to greater productivity.