Nowadays, there is a surge of B2C and B2B e-commerce operatedudon the Internet. However, many of these systems are often nothingudmore than electronic product or service catalogues. Against this background,udit is argued that new generation systems based on automaticudnegotiation will emerge. This paper covers a particular kind of automaticudnegotiation systems, where a number of participants in a mobileuddynamic electronic marketplace automatically negotiate the purchase ofudproducts or services, by means of multiple automated one-to-one bargainings.udIn a dynamic e-marketplace, the number of buyers and sellersudand their preferences may change over time. By mobile we mean thatudbuyers in a commercial area may initiate simultaneous negotiations withudseveral sellers using portable devices like cell phones, laptops or personaluddigital assistants, so these negotiations do not require participants to beudcolocated in space. We will show how an expressive approach to fuzzyudconstraint based agent purchase negotiations in competitive trading environments,udis ideally suited to work on these kind of e-marketplaces. Anudexample of mobile e-marketplace, and a comparison between an expressiveudand an inexpressive approach will be presented to show the efficiencyudof the proposed solution.
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