Statistical mechanics of money: how saving propensity affects its distribution
Abstract
We consider a simple model of a closed economic system where the total money is conserved and the number of economic agents is fixed. In analogy to statistical systems in equilibrium, money and the average money per economic agent are equivalent to energy and temperature, respectively. We investigate the effect of the saving propensity of the agents on the stationary or equilibrium money distribution.The equilibrium probablity distribution of money becomes the usual Gibb's distribution, characteristic of non-interacting agents, when the agents do not save. However with saving, even for local or individual self-interest, the dynamics become cooperative and the resulting asymmetric Gaussian-like stationary distribution acquires global ordering properties. Intriguing singularities are observed in the stationary money distribution in the market, as function of the ``marginal saving propensity'' of the agents.
- Publication:
-
European Physical Journal B
- Pub Date:
- August 2000
- DOI:
- 10.1007/s100510070173
- arXiv:
- arXiv:cond-mat/0004256
- Bibcode:
- 2000EPJB...17..167C
- Keywords:
-
- 87.23.Ge;
- 05.90.+m;
- 89.90.+n;
- Dynamics of social systems;
- Other topics in statistical physics thermodynamics and nonlinear dynamical systems;
- Other topics in areas of applied and interdisciplinary physics;
- Condensed Matter - Statistical Mechanics;
- Quantitative Finance - General Finance
- E-Print:
- 9 pages, 5 figures. Revised version with major changes in the text and figures (to appear in Euro. Phys. Jour. B)