基于Priceline的易腐品网上逆向拍卖研究
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摘要
电子商务为新的商业模式提供了广阔的天地,同时各种商业模式也丰富了电子商务的发展,由Priceline.com率先推出的B2C网上逆向拍卖模式就是其中之一。Priceline采用独特的“由你定价”交易模式,在成立的几年内已经在注册用户数量、营业收入和业内影响力等方面取得了骄人成绩,成为国际著名网站。然而,对B2C网上逆向拍卖的定量理论研究相对较少,本论文将对通过Priceline交易的顾客(买方)和商家(卖方)进行研究,重点在于买方的报价策略和卖方的保留价策略。
     首先,采用不完全信息静态博弈的方法,在一定的条件下,建立卖方的模型,证明卖方均衡保留价随其成本递增,但是小于其成本;分析买方报价策略,证明买方最优报价随其估价递增,并且满足既定条件时是唯一最优报价;对卖方保留价策略和买方报价策略进行数值分析,结果验证了理论分析的正确性。
     随后,研究在通过Priceline销售易腐商品的过程中,卖方如何动态设定其保留价,从而使得自己在销售期内的期望收益最大。分别从连续时间和离散时间两个角度进行研究。首先研究连续时间情形,运用最优控制的方法建立数学模型,并进行理论分析,获得了最优值和最优策略的一些性质;之后运用动态规划方法建立多阶段卖方动态设定保留价模型,得到了和连续时间模型相似的性质;数值分析进一步说明我们的结论,并和传统收益管理进行比较,得出结论。
     论文还探讨基于Priceline的买方/卖方定价收益管理问题。假定顾客到达是一任意的更新过程,决策时刻为顾客到达时刻。对于每个顾客只有单个需求的情形,分别建立卖方定价和买方定价下的马氏决策过程模型,并获得最优策略的表达式。而在传统收益管理问题中,通常是卖方定价、连续时间决策、同时需要假定顾客到达是一Poisson过程。对于买方定价,证明卖方是否知道到达顾客的报价信息不影响他的收益;同时,随着剩余物品数的增加,卖方的期望收益递增,而边际收益和最优价格递减。对于卖方定价,对期望收益和最优价格得到类似的结论。之后讨论两种定价方式下卖方的期望收益之间的关系;并将结论推广到顾客需求是多重的情形。数值分析验证了所得的结论。
Electronic commerce has provided a wide field for the new business models. Meanwhile, all kinds of business models have enriched the electronic commerce's development. In the Business-to-Customer situation, one of them is reverse auctions represented by Priceline.com. As the unique business model of Name Your Own Price, Priceline has owned millions of registration users and rapid growth of business income. It mainly deals in perishable commodities and has been a famous international reverse auction website since it was operated. However, quantitative research on Priceline is relatively not rich. The dissertation aims to study customers' behavior and sellers' policies based on Priceline, mainly on customers' bidding strategies and sellers' pricing policies. The main contribution of the dissertation includes the following three aspects.
     First, the dissertation studies the reserve price policies for the sellers and the bidding strategies for the customers by static game theory under incomplete information. We show under some basic assumptions that the optimal reserve price is increasing in the cost, but less than the cost for the seller. We also show that customers' bidding prices are increasing in their valuation, and the optimal bidding prices are exclusive under some condition. The results have been illustrated by numerical analysis.
     Second, this dissertation studies a problem of how to dynamically set reserve prices for some goods of the seller in a period of time when customers arrive at Priceline one after another according to a non-stationary Poisson process, so that the seller can gain maximal expected revenue. We consider this problem in two aspects, one is the continuous time model, and the other is the multi-stage model. The dissertation discusses the continuous time model first. The optimal control model of the expected revenue for sellers is presented, and some theoretical results have been obtained. After that, we set up a multi-stage mathematical model with dynamic programming, and make analysis on this model. Some properties of optimal value and optimal price are obtained, which are quite similar to the ones of continuous time model. Numerical analysis are consistent with theoretical results, and the comparison of traditional revenue management with continuous time model illustrates that the closer the bidding price is to the valuation, the more dominant Priceline will be to revenue management.
     Finally, we study revenue management problems with either customer-pricing or seller-pricing. Here, a seller wants to sell a given amount of items in a fixed time, customers arrive according to an arbitrary renewal process. In the customer pricing, customers bid and then the seller decides to accept or reject their bids; while in the seller pricing, the seller decides the price and then customers determine to accept or reject the price. Markov decision processes models are presented and expressions for the optimal policies are obtained. These problems differ from the traditional revenue management problems where (1) the seller sets continuously a price, and (2) customers arrive according to a Poisson process. It is shown for the customer-pricing that there is no impact on the seller whether or not he knows the customers' private information, the optimal policy is monotone in the remaining items, and the optimal value is the concave function of the remaining items. Similar results of expected revenue and optimal price strategy have been obtained. Also, the expected revenues of the seller in the two pricing cases are compared, and the models and the results are generalized to the multiple demand case. Finally, the models and the results are illustrated by numerical analysis.
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