Cambridge capital controversy
The Cambridge capital controversy is a dispute in economics that started in the 1950s. The debate concerned the nature and role of capital goods and a critique of the neoclassical vision of aggregate production and distribution. The question of whether the natural growth rate is exogenous, or endogenous to demand (and whether it is input growth that causes output growth, or vice versa), lies at the heart of the debate. The resolution of the debate has not been agreed upon by economists.
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Source: List of unsolved problems in economics (CC BY-SA 4.0)