It is not difficult to imagine substantive answers to the confrontational question posed by Felipe and McCombie (“Why is the aggregate production function still widely used . . . ?”). Three such answers suggest themselves: (1) The alleged paradoxes are not so paradoxical once the particulars of the trumped-up instances of them are fully understood. (2) The particular temporal profiles of reswitching-prone techniques are sufficiently quirky as to warrant neglect in setting out fundamental supply-side principles – a mode of argument that has its parallel in the neglect of the Giffen good in setting out fundamental demand-side principles. (3) No actual instances of the paradoxical supply-side phenomena have ever been identified by the Cantabrigians – there not being even so much as a suspected instance to parallel the suspected upward-sloping demand for Giffenesque potatoes in Ireland during the mid-nineteenth-century famine.
--Roger W. Garrison, "Reflections on Reswitching and Roundaboutness," in Money and Markets: Essays in Honor of Leland B. Yeager, ed. Roger Koppl, Foundations of the Market Economy (London: Routledge, 2006), 188.
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