We explore the Alchian–Allen effect–that is, the effect of an absolutely equal increase in the price of two goods on their demand ratio–for conditional (viz. short-run) and unconditional (viz. long-run) demand functions. We show that the Alchian–Allen effect for unconditional demand...

This paper provides, as a counter example to the Alchian–Allen theorem, a theory of Giffen-like goods: a per unit charge to two similar goods raises the relative price of the lower quality good and yet increases the (relative) demand of the good.