دانلود مقاله ISI انگلیسی شماره 52039
عنوان فارسی مقاله

توزیع ثروت مدل های مبادله ساده همراه با پویایی فوق العاده

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
52039 2015 8 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Wealth distribution of simple exchange models coupled with extremal dynamics
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Physica A: Statistical Mechanics and its Applications, Volume 417, 1 January 2015, Pages 168–175

کلمات کلیدی
عوامل تبادل مدل - تعادل نشان دار - توزیع ثروت - شاخص جینی
پیش نمایش مقاله
پیش نمایش مقاله توزیع ثروت مدل های مبادله ساده همراه با پویایی فوق العاده

چکیده انگلیسی

Punctuated Equilibrium (PE) states that after long periods of evolutionary quiescence, species evolution can take place in short time intervals, where sudden differentiation makes new species emerge and some species extinct. In this paper, we introduce and study the effect of punctuated equilibrium on two different asset exchange models: the yard sale model (YS, winner gets a random fraction of a poorer player’s wealth) and the theft and fraud model (TF, winner gets a random fraction of the loser’s wealth). The resulting wealth distribution is characterized using the Gini index. In order to do this, we consider PE as a perturbation with probability ρρ of being applied. We compare the resulting values of the Gini index at different increasing values of ρρ in both models. We found that in the case of the TF model, the Gini index reduces as the perturbation ρρ increases, not showing dependence with the agents number. While for YS we observe a phase transition which happens around ρc=0.79ρc=0.79. For perturbations ρ<ρcρ<ρc the Gini index reaches the value of one as time increases (an extreme wealth condensation state), whereas for perturbations greater than or equal to ρcρc the Gini index becomes different to one, avoiding the system reaches this extreme state. We show that both simple exchange models coupled with PE dynamics give more realistic results. In particular for YS, we observe a power low decay of wealth distribution.

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