Aggregation service as a way to collect relevant information from multiple sources of information goods and add high value to the goods, has emerged to help individuals and businesses to effectively use the growing amount of information on the Web. Aggregation of information goods will dominate when reductions in marginal costs made possible by low-cost of digital processing and storage of information, while lower transaction and delivery costs tend to make disaggregation. It is discussed the present status and future direction of aggregation service on the Web. A number of aggregation services are classified into major groups of comparison, relationship, intra and inter. The aggregation services of news, ebook, electronic journal and content are explained in detail. It is supposed that aggregation service will expand in a future by developing the technology of digital processing and networking.
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