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<TITLE>Contents of JAIS, Volume 13, Issue 2 (February)</TITLE>
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<P><FONT SIZE=2>Contents of Volume 13, Issue 2 (February)<BR>
Journal of the Association for Information Systems (JAIS)<BR>
Official Publication of the Association for Information Systems<BR>
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Published: Monthly Electronically<BR>
ISSN: 1536-9323<BR>
Published by the Association for Information Systems, Atlanta, USA<BR>
<A HREF="http://aisel.aisnet.org/jais/">http://aisel.aisnet.org/jais/</A><BR>
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Editor-in-Chief: Professor Shirley Gregor, the Australian National University, Australia<BR>
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PAPER ONE<BR>
Pure-Strategy Nash Equilibria of GSP Keyword Auction<BR>
By Linjing Li, Daniel Zeng, and Huimin Zhao<BR>
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Abstract<BR>
Despite the tremendous commercial success of generalized second-price (GSP) keyword auctions, it still remains a big challenge for an advertiser to formulate an effective bidding strategy. In this paper, we strive to bridge this gap by proposing a framework for studying pure-strategy Nash equilibria in GSP auctions. We first analyze the equilibrium bidding behaviors by investigating the properties and distribution of all pure-strategy Nash equilibria. Our analysis shows that the set of all pure-strategy Nash equilibria of a GSP auction can be partitioned into separate convex polyhedra based on the order of bids if the valuations of all advertisers are distinct. We further show that only the polyhedron that allocates slots efficiently is weakly stable, thus allowing all inefficient equilibria to be weeded out. We then propose a novel refinement method for identifying a set of equilibria named the stable Nash equilibrium set (STNE) and prove that STNE is either the same as or a proper subset of the set of the well-known symmetrical Nash equilibria. These findings free both auctioneers and advertisers from complicated strategic thinking. The revenue of a GSP auction on STNE is at least the same as that of the classical Vickrey-Clarke-Groves mechanism and can be used as a benchmark for evaluating other mechanisms. At the same time, STNE provides advertisers a simple yet effective and stable bidding strategy.<BR>
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To obtain a copy of the entire article, click on the link below:<BR>
<A HREF="http://aisel.aisnet.org/jais/vol13/iss2/2/">http://aisel.aisnet.org/jais/vol13/iss2/2/</A><BR>
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PAPER TWO<BR>
Examining Two Expectation Disconfirmation Theory Models: Assimilation and Asymmetry Effects<BR>
By Nancy K. Lankton and Harrison D. McKnight<BR>
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Abstract<BR>
Expectation disconfirmation theory (EDT) posits that expectations, disconfirmation, and performance influence customer satisfaction. While information systems researchers have adopted EDT to explain user information technology (IT) satisfaction, they often use various EDT model subsets. Leaving out one or more key variables, or key relationships among the variables, can reduce EDT's explanatory potential. It can also suggest an intervention for practice that is very different from (and inferior to) the intervention suggested by a more complete model. Performance is an especially beneficial but largely neglected EDT construct in IT research. Using EDT theory from the marketing literature, this paper explains and demonstrates the incremental value of using the complete IT EDT model with performance versus the simplified model without it. Studying software users, we find that the complete model with performance both reveals assimilation effects for less experienced users and uncovers asymmetric effects not found in the simplified model. We also find that usefulness performance more strongly influences usage continuance intention than does any other EDT variable. We explain how researchers and practitioners can take full advantage of the predictive and explanatory power of the complete IT EDT model.<BR>
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To obtain a copy of the entire article, click on the link below:<BR>
<A HREF="http://aisel.aisnet.org/jais/vol13/iss2/1">http://aisel.aisnet.org/jais/vol13/iss2/1</A><BR>
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