Abstract
Neo-classical economic theory is based on the postulated, nonempiric notion of utility. Neo-classical economists assume that prices, dynamics, and market equilibria are supposed to be derived from utility. The results are supposed to represent mathematically the stabilizing action of Adam Smith’s invisible hand. In deterministic excess demand dynamics I show the following. A utility function generally does not exist mathematically due to nonintegrable dynamics when production/investment are accounted for, resolving Mirowski’s thesis. Price as a function of demand does not exist mathematically either. All equilibria are unstable. In the generalization to liquid markets and finance theory described by stochastic excess demand dynamics, I also show the following. Market price distributions cannot be rescaled to describe price movements as ’equilibrium’ fluctuations about a systematic drift in price. Utility maximization does not describe equilibrium. Maximization of the Gibbs entropy of the observed price distribution of an asset would describe equilibrium, if equilibrium could be achieved, but equilibrium does not describe real, liquid markets (stocks, bonds, foreign exchange). There are five inconsistent definitions of equilibrium used in economics and finance, only one of which is correct. Prices in unregulated free markets are unstable against both noise and rising or falling expectations: Adam Smith’s stabilizing invisible hand either does not exist or doesn’t work, either in mathematical models of liquid market data, or in real market data.
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McCauley, J.L. (2002). Where is Adam Smith’s Invisible Hand?. In: Skjeltorp, A.T., Vicsek, T. (eds) Complexity from Microscopic to Macroscopic Scales: Coherence and Large Deviations. NATO Science Series, vol 63. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0419-0_11
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DOI: https://doi.org/10.1007/978-94-010-0419-0_11
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