Competitive Equilbrium: Walras Meets Darwin.

Prime objects of this note are (I) excess demand generated by price-taking economic agents, and (II) an alternative version of tatonnement. We relate laws of demand, axioms of revealed preferences, and other notions of generalized monotonicity to evolutionary stable prices. Focus is on local stability of competitive equilibrium. Specifically, we establish that evolutionary stable prices are asymptotically attractive under so-called replicator dynamics.