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外部性
Wikipedia definition
1. Network effectIn economics and business, a network effect (also called network externality or demand-side economies of scale) is the effect that one user of a good or service has on the value of that product to other people. When network effect is present, the value of a product or service is dependent on the number of others using it.
Read “Network effect” on English Wikipedia
Read “ネットワーク外部性” on Japanese Wikipedia
Read “Network effect” on DBpedia

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