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<p>the concept is valid.</p>

<p><big>Criticisms of the production function theory</big></p>
<p>There are two major criticisms of the standard form of the production function.</p>

<p><big>On the concept of capital</big></p>
<p>During the 1950s, '60s, and '70s there was a lively debate about the theoretical soundness of production functions (see the <a href="page.php?w=Capital_controversy">Capital controversy</a>). Although the criticism was directed primarily at aggregate production functions, microeconomic production functions were also put under scrutiny. The</p><p>
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