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This is the published version of the paper.This version of the publication may differ from the final published version. We apply transaction cost economic theory and perspectives in an empirical test regarding purchasing performance using electronic marketplaces. Basically, buyers can purchase products either by hopping across multiple electronic marketplaces or maintaining close relationships with a particular electronic marketplace. We investigate which is more beneficial for a buyer organization's purchasing performance in terms of price reduction and purchasing efficiency. We undertake this task by developing hypotheses and a research model and subjecting them to testing and analysis using the purchase of maintenance, repair and operations products in a large and important market, South Korea. Permanent

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This study is research of actual proof on verification of the user's utility about mobile convergence products and the types of convergence categorize into four types according to their characteristics. Four types of convergence; ①Open service via scalable internet, ②Close service dependent on mobile phones, ③Broadcast services such as DMB, ④Individual products such as camera based on digital technology. The purpose of research model is to identify differences in effect value of the types of mobile convergence according to its usage level and level of quality. As the result of this study, Usage level of open service/individual products had a significant effect on the user's utility about mobile convergence products, Also Level of quality of open service had a significant effect.

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