Every bit of this graph is quite troubling. The US greatly lags in workers during prime working years and fails to retire many of its old people, who are forced instead to work until death.
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If the US had Finnish employment rates, it would have 4.4 million additional workers (3.1% more workers). If it had Norwegian employment rates, it would have 17.8 million additional workers (12.4% more workers). There are multiple reasons why the US trails the Nordic countries by so much, but probably chief among them is that its lack of leave and child care benefits keeps many women out of the labor force.