Inequality of Chances as a Symmetry Phase Transition
Abstract
:1. Introduction
2. Thermodynamics of Inequality
2.1. Assumptions
- Finiteness. Real-world benefits are finite, with and , and is bounded, continuous, differentiable and single-peaked in an open interval, , while otherwise.
- Generalised Pareto criterion. Individuals interact, and the resulting relationship is reflexive, symmetric and transitive, defining a class of equivalence. Two mutually exclusive such classes – poor and rich, young and old, healthy and sick, etc.—describe schematically, provided the boundary between them is realistically defined [20]. If the two classes are equally populated (a conceptually possible case), then . Otherwise satisfies the equation , a simple generalisation of Pareto’s 80/20 well-known rule.
- Entropy. The most probable state of the whole society with respect to a given type of benefit maximises the entropy functional. Entropy decreases as inequality increases, and goes to zero in the limit of absolute inequality, where a single individual gets the whole benefit and leaves nothing to others.
- Phase transition. The change from to marks a second-order phase transition from symmetric to asymmetric distributions. The entropy and are continuous across the transition.
2.2 Statistical Mechanics and Lorenz Functions
2.2.1. L-Curves
2.2.2. Symmetry, Class Boundaries and Discontinuities
2.3. Universality
3. The Transition to Convexity
3.1. Probabilistic Model
3.1.1. Entropy Maximisation
3.1.2. Class Asymmetry and Intersections of L-Curves
4. Results
4.1. Fitting Empirical Data
4.2. A New Indicator
BENEFIT | k2 | FP | XM | Giuc(k) | ||||
---|---|---|---|---|---|---|---|---|
Income | 0.008 | 0.58 | 0.68 | 0.16 | 0.99 | 0.35 | 0.46 | 0.16 |
Electricity consumption | 0.046 | 0.66 | 0.52 | 0.32 | 0.97 | 0.04 | 0.60 | 0.38 |
Life expectation | 0.159 | 0.76 | 0.55 | 0.52 | 0.89 | 0.10 | 0.79 | 0.68 |
Model limits | 0.220 | 0.80 | 0.5 | 0.60 | 0.85 | 0 | 0.85 | 0.78 |
Survival after cancer | 0.344 | 0.86 | 0.45 | 0.71 | 0.78 | –0.11 | –– | –– |
5. Conclusions
Appendix: Two Lemmas on Convexity
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Rosenblatt, J. Inequality of Chances as a Symmetry Phase Transition. Entropy 2013, 15, 1985-1998. https://doi.org/10.3390/e15061985
Rosenblatt J. Inequality of Chances as a Symmetry Phase Transition. Entropy. 2013; 15(6):1985-1998. https://doi.org/10.3390/e15061985
Chicago/Turabian StyleRosenblatt, Jorge. 2013. "Inequality of Chances as a Symmetry Phase Transition" Entropy 15, no. 6: 1985-1998. https://doi.org/10.3390/e15061985
APA StyleRosenblatt, J. (2013). Inequality of Chances as a Symmetry Phase Transition. Entropy, 15(6), 1985-1998. https://doi.org/10.3390/e15061985