Non-manipulability of uniform price auctions with a large number of objects

Non-manipulability of uniform price auctions with a large number of objects
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大量标的统一价格拍卖的不可操纵性

DOI:
10.1007/s00182-018-0641-y
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发表时间:
2018
影响因子:
0.6
通讯作者:
Kazumura Tomoya
Kazumura Tomoya
中科院分区:
经济学4区
文献类型:
--
作者:
Tajika Tomoya;Kazumura Tomoya

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当代理人(投标人)具有多需求偏好时,统一价格拍卖通常不能免受代理人的策略操纵,并且它们可能实现无效率的分配。我们考虑的经济体中,大量的相同的对象已被分配。代理人有准线性偏好与非递增增量估值。研究了统一价格拍卖中代理人的激励问题。提出了一个关于偏好的重要假设,称为“无垄断”。它要求偏好应该以这样一种方式相互关联,即当代理人收到足够多的对象时,他对额外对象的增量估值不会高于其他代理人。我们表明,在没有垄断和其他温和的偏好假设下,随着物品的数量趋于无穷大,在任何统一价格拍卖中的支付收敛到Vickrey拍卖中。我们推断,当有足够多的对象,讲真话是一个近似的贝叶斯纳什均衡在每个统一价格拍卖。
When agents (bidders) have multi-demand preferences, uniform price auctions are generally not immune to agents’ strategic manipulation, and they may achieve an inefficient allocation. We consider economies in which a large number of identical objects have to be allocated. Agents have quasi-linear preferences with non-increasing incremental valuations. We explore the incentives of agents in uniform price auctions. An important assumption on preferences is proposed, called “no monopoly.” It requires that preferences should be correlated in such a way that no agent’s incremental valuation for an additional object when he receives sufficiently many objects is higher than those of the other agents. We show that under no monopoly and other mild assumptions on preferences, as the number of objects goes to infinity, the payment in any uniform price auction converges to that in a Vickrey auction. We deduce that when there are sufficiently many objects, truth-telling is an approximate Bayesian Nash equilibrium in each uniform price auction.
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