Dynamic Stability of Post-Keynesian Pricing

Conventional economic theory assumes a Walrasian pricing mechanism that is known to pose theoretical difficulties. Less well-known is that conventional price theory conflicts with empirical studies of price-setting in industrial firms. Post-Keynesian theory, which assumes mark-up pricing on normal costs and infrequent price changes, is consistent with observation, and we show in this paper that post-Keynesian pricing, unlike conventional pricing, features stable dynamics. We focus on the short run, because post-Keynesian theory posits complex and historically-contingent long-term price dynamics. Specifically, we show that under very general conditions, prices converge to a unique equilibrium price vector.