佣金约束条件下排污权双边叫价拍卖机制设计

通过排污权交易提高环境资源的使用效率和配置效率,实现环境资源最优配置。排污权和排污权市场理论研究是环境资源可持续利用的重要研究课题,而排污权交易模型是排污权市场理论与实践中排污权交易的核心。本文采用双边叫价拍卖交易模式,建立了排污权交易双边叫价拍卖的不完全信息博弈模型,给出了双边叫价拍卖的机制设计。该机制具有有效性和激励相容性。     

On efficient trading mechanisms between one seller and n buyers

Myerson and Satterthwaite (1983) prove that if one seller and one buyer have independent private valuations for an indivisible object then no individually rational and incentive compatible trading mechanism can guarantee ex post efficiency when gains from trade are uncertain. Makowski and Mezzetti (1993) show that this is not the case when there are at least two buyers. In the latter context, if the highest possible seller's valuation is not too large, we provide an ex post efficient mechanism in which the mechanism designer and the agents are not required to know the probability distribution for the seller's valuation. Received: February 18, 1998 / Accepted: September 10, 1999     

Neutrality of buyer and seller commissions to auction house profit

This paper presents an examination of optimal revenue management of a monopoly auction house through which a seller sells goods via a second‐price auction. The house charges commissions to both the buyer and seller. Results demonstrate that a continuum of combinations of optimal buyer and seller commission rates exists, all of which yield the same expected profit of the house. Additionally, we discuss several possible factors that lead to the prevailing custom of zero buyer commission, such as commission aversion of buyers, the house's incentive to maximize the hammer price, and seller and buyer preferences for apparently lowered commission rates.     

Contract Renegotiation with Time-Varying Valuations

The paper characterizes optimal renegotiation-proof rental contracts in a model with adverse selection and hidden information. It generalizes the work of Hart and Tirole (1988) to the case of time-varying valuations. The paper considers a durable-goods monopolist who serves a nonanonymous buyer with time-varying valuation for the seller's good. The buyer's valuation has a persistent and a transient component; both are private information. The paper shows that for some range of prior beliefs the seller strictly prefers leasing to selling.     

Bundling and the Reduction of the Winner's Curse

The paper studies the effects of bundling on the bidding strategies and seller revenues in auctions when the bidders have common values for the objects. Bundling of objects before the auction reduces the problem of the winner's curse, and the bidders bid more aggressively. This does not mean that a bundled auction is always better for the seller's revenue. Indeed, there is another effect that makes the bundled auction preferable (from the seller's standpoint) if and only if the number of bidders is small. While this is the only effect present in an independent-private-values model, it does not vanish when bidders have pure common values for the objects. The paper concludes that a bundled auction is unambiguously better for the seller than separate auctions when the number of bidders is small.     

供应链环境下销售商的风险分析及评估

在对供应链环境下销售商的风险进行分析的基础上，利用风险因素分析和多级模糊综合评估相结合的方法进行风险评估．建立相应模型．进一步用风险系数量化销售商风险的大小。     

Price experimentation with strategic buyers

A two-period model in which a monopolist endeavors to learn about the permanent demand parameter of a specific repeat buyer is investigated. The buyer may strategically reject the seller’s first-period offer for one of two reasons. First, in order to conceal information (i.e., to pool), a high-valuation buyer may reject high prices that would never be accepted by a low-valuation buyer. Second, in order to reveal information (i.e., to signal), a low-valuation buyer may reject low prices that would always be accepted by a high-valuation buyer. Given this, the seller often finds it optimal to post prices that reveal no useful information. Indeed, in the equilibrium where there is no signaling, the seller never charges an informative first-period price. Learning may occur in the equilibrium where there is maximal signaling, but the scope for learning is quite limited even in this case. Indeed, in order to preempt information transmission through signaling, the seller may be induced to set a first-period price strictly below the buyer’s lowest possible valuation.      

Search and Trading in Intermediated Markets

This paper examines the effect of a middleman on the search and trading behavior of the traders. It is shown that the buyer and seller types with middle valuations choose to search for each other, while the buyer and seller types with high or low valuations drop out of the search market and choose to trade directly with the middleman. The ask and bid prices of the middleman act as an outside option for the buyer and seller, and influence the outcome of the bargaining between the two. The model generalizes Gehrig (1993) by endogenizing the traders' search intensities, by allowing the traders to go to an intermediary even if thy have engaged in search, and by enabling the intermediary to provide the service of immediacy.     

Adverse selection and costly information acquisition in asset markets

We develop an asset exchange model with adverse selection and costly information acquisition incentives. A seller of an asset knows the true value of the asset, while a buyer can obtain information about the asset’s quality at a cost. An equilibrium offer is pooling, but a buyer can purchase only good assets after producing the costly information about the asset’s quality. When the probability that the seller holds good assets is above the threshold value, a trade can occur with and without information acquisition, depending on the information acquisition cost, and the trade volume and social welfare are higher in equilibrium without information production than in equilibrium with information production. When the probability of facing good assets is below the threshold value, a trade occurs only after screening the quality of assets, and, hence, the market collapses if the information acquisition cost is sufficiently high. As the information acquisition cost increases, social welfare can increase or decrease depending on the probability of facing good and bad assets.     

Monopsony and two-part tariffs

We adapt the traditional model of two-part tariffs by a monopolist to the case of monopsony. We show that the resulting offer is that the seller pays its producer surplus as an access fee in exchange for the buyer's promise to buy everything that the seller wants to sell when price equals marginal cost. In addition, we show that this is equivalent to the surplus that the buyer captures with first-degree price discrimination as well as an all-or-nothing offer. We also extend this analysis to the case of uncertainty for a risk-averse monopsonist.     

Optimal auctions under collusion of buyers with discrete valuations

The potential seller of an indivisible good faces two potential buyers whose valuations for the good are private information. We derive the optimal selling mechanism under the assumption that the buyers collude both when the valuations are independently distributed and when they are correlated. We find that when the valuations are independent the seller can obtain the same expected revenue as if the buyers behaved noncooperatively; if instend the valuations are correlated then collusion harms the seller. In this latter case, moreover, each buyer’s information at the collusion stage about the other buyer’s valuation turns out to be very relevant for the effectiveness of collusion.     

Buyer brokerage: Experimental evidence

This paper offers an experimental investigation of two commission structures for buyer brokerage. One commission structure is the currently used structure in the industry where both the seller’s broker and the buyer’s broker each receive a percentage of the sales price as their compensation from the seller. In an alternative commission structure, while the seller’s broker still receives a percentage of the sales price from the seller, the buyer’s broker is compensated by the buyer and the compensation is inversely related to the sales price. We find that how the buyer’s broker gets compensated has significant implications. While both commission structures yield a similar probability of reaching an agreement, the alternative commission structure yields a lower price and a longer time to reach an agreement. Furthermore, the alternative commission structure achieves a better alignment of the interests of the buyer and the buyer’s broker without affecting the earnings of the players in the transaction. We also find that the improvement in the alignment of interests is more significant for female buyers than for male buyers. Furthermore, a higher listing price by the seller and a higher initial bid price by the buyer each lead to a significant increase in the negotiated price.     

The quality assurance role of seller financing: evidence from second mortgages

Quality problems that are known to the seller of a product, but will become known to the buyer only after the purchase have the potential to frustrate voluntary exchanges. Where the determination of quality after the sale is cut-and-dried, brand names and unconditional guarantees will bond contract performance. When the problem is more subtle or confounded by the extent of consumer inputs, requiring risk-sharing by the contracting parties, these bonding devices typically are not sufficient. Under the circumstances, seller financing may be an efficient contracting solution for bonding the quality dimension of the contract. This form of financing makes both the buyer and the seller share the risk that the product may not suit the buyer’s needs in the way promised by the seller. This paper provides further empirical evidence on the quality assurance role of seller financing. We consider seller-financed second mortgages in the National Association of Realtors database. Seller financing in second mortgages may be a supplement to first mortgages supplied by conventional lenders. The role of seller financing as a quality assurance mechanism in second mortgages is more complex than its role in first mortgages, but is also less subject to an alternative interpretation of credit rationing than is its role in seller-financed first mortgages. To avoid further complexities, we do not consider second seller financing transactions that supplement first assumption mortgage transactions.     

Descending price multi-item auctions

We propose a simultaneous descending price auction mechanism to sell multiple heterogeneous items, each owned by a distinct seller, to a number of buyers. Each buyer has known private valuations on items, and wants at most one item. We show that if the sellers follow a descending price offer procedure and the buyers follow a greedy strategy for accepting the offers, the auction results in a nearly efficient allocation, and terminates close to a competitive equilibrium price vector. The descending price offer strategy of the sellers is close to a Nash equilibrium. However, we show that the buyers are better off waiting in our auction. There is a maximum limit (corresponding to the minimum competitive equilibrium price vector) till which they can wait without running into the risk of not winning any item. If the buyers wait within this limit, the prices can be brought arbitrarily close to a uniquely defined competitive equilibrium price vector.     

Group Buying Commitment and Sellers’ Competitive Advantages

This paper examines a model of duopoly firms selling to an exogenously formed buyer group consisting of members with heterogeneous preferences. Two research questions are addressed: (1) when is it optimal for a buyer group to commit to exclusive purchase from a single seller, and (2) how does the presence of group buying and the exclusive purchase commitment associated with it affect firms’ incentives to invest in quality improvement? We find that, even though exclusive purchase commitment benefits buyers when the competing products provide similar quality, it may lower buyer surplus if one product is significantly advantaged and/or the competing products are not highly differentiated horizontally. This result is robust even if the buyer group is formed endogenously. In addition, contingent on the similarity between the competing sellers’ investment costs, the sellers’ incentives to improve quality may be positively or negatively affected by the presence of group buying.     

基于拍卖的垄断型产品供应链的博弈分析

论文研究了基于拍卖交易的垄断型产品供应链中卖方和买方的博弈问题,成交价格同时取决于卖方向拍卖市场的供货数量和买方向拍卖市场的竞拍数量。博弈结果显示,在垄断供应的情况下,博弈的纳什均衡将会是买卖双方都不通过拍卖渠道来进行交易,只有在非常极端的条件下可以达成供货和竞拍等量的均衡。最后,论文引入一个新卖方作为买方参与拍卖后的补货来源,得到的新均衡解能使原买卖双方的收益提高,从而说明单纯的拍卖并不总是最好的交易方式,多渠道的销售方式有时更能保障买卖双方的利益。     

A mechanism for package allocation problems with gross substitutes

We consider a package allocation problem in which a seller owns many indivisible objects and the rest of the agents, buyers, are interested in packages of these objects. Buyers’ valuations satisfy monotonicity and the gross substitutes condition (Kelso and Crawford, 1982). The aim of this paper is to analyze the following mechanism: simultaneously, each buyer requests to the seller a package by announcing how much he would pay for it; once buyers have played, the seller decides the final assignment of packages and the prices, as long as this assignment makes no buyer worse off than with his initial request. The subgame perfect equilibrium outcomes of the mechanism correspond to the Vickrey outcome (Vickrey, 1961) of the market.     

Equilibrium in a market with intermediation is Walrasian

We show that a profit maximizing monopolistic intermediary may behave approximately like a Walrasian auctioneer by setting bid and ask prices nearly equal to Walrasian equilibrium prices. In our model agents choose to trade either through the intermediary or privately. Buyers (sellers) trading through the intermediary potentially trade immediately at the ask (bid) price, but sacrifice the spread as gains. A buyer or seller who trades privately shares all the gains to trade with this trading partner, but risks costly delay in finding a partner. We show that as the cost of delay vanishes, the equilibrium bid and ask prices converge to the Walrasian equilibrium prices. Received: 2 February 1996 / Accepted: 28 March 1997     

Asset sales and takeover threats

This research addresses the question of whether the existence of a recent takeover threat affects the market reaction to a subsequent sale of assets. The effect of a prior takeover threat on the stock price reaction to an asset sale is examined from the perspective of both the buying firm and the selling firm. The total gains to the transaction are estimated as a market weighted average of the abnormal returns to the two firms. The results show that when there has not been a recent takeover threat on the selling firm, abnormal returns are significantly positive for the seller, the buyer and in total. However, if the selling firm has faced a takeover threat within the previous year, the abnormal returns upon announcement of an asset sale are insignificant for the seller, negative for the buyer, and negative for a portfolio of the two. Hence, the market has a lower estimate of the overall gains in transactions that follow takeover threats on the selling firm; in fact, these transactions result in a net wealth reduction.     

Optimal two-object auctions with synergies

We design the revenue-maximizing auction for two objects when each buyer has bi-dimensional private information and a superadditive utility function (i.e., a synergy is generated if a buyer wins both goods). In this setting the seller is likely to allocate the objects inefficiently with respect to an environment with no synergies (see Armstrong, RES (2000)). In particular, the objects may be bundled too rarely or a buyer may win the bundle even though her valuations for the goods are weakly dominated by the values of another buyer.Received: 29 October 2001, Accepted: 29 October 2002, JEL Classification: D44, D82This paper has been written while the author was a member of the Dipartimento di Statistica e Matematica Applicata alle Scienze Umane "Diego De Castro", Universitá degli Studi di Torino, Italy. Valuable comments and suggestions were provided by Antonio Cabrales, Massimo Marinacci, three anonymous referees and, especially, by Mark Armstrong. The usual disclaimer applies.