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In Chakraborti's yard-sale model of an economy, identical agents engage intrades that result in wealth exchanges, but conserve the combined wealth of allagents and each agent's expected wealth. In this model, wealth condensation,that is, convergence to a state in which one agent owns everything and theothers own nothing, occurs almost surely. We give a proof of this fact that ismuch shorter than existing ones and extends to a modified model in which thereis a wealth-acquired advantage, i.e., the wealthier of two trading partners ismore likely to benefit from the trade.

A new probabilistic analysis of the yard-sale model