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ؼ ϴ. ̷, з, Ư ֿ䳻 κó ߰ ü鼭, 鼭, ߽ϴ. ߿ ̷ 濡 primary source ߽ Խϴ. ù мο ظ ڸ ѱ۷ ǥ߰, ο APA(American Psychological Association) Ÿ ؿϿ ǥ(, ̸ ̴ϼ) ߽ϴ. ѼսŰ ʰ Ϲ 忡 ǥ߽ϴ. հ ڿ ̼ǰ ̽ ־ 4 ô븦 ư 츮 ̷ Ҿְ ߽ϴ. ̹ ۱ǿ ˵ ʴ ڷḸ ϰ (Google) (labeled for reuse) ̹ ַ ߽ϴ. ΰ ο ϰ, ְ ߴ ٺ ÷(Alvin Toffler, 1928~2016) Ƽ ⽺(Steve Jobs, 1955~2011) й, ǹ о ȭθ Ÿ߽ϴ. ̷ ϰ ϴ. ȮŰ, (market) ο з ϴ ʸ Ʋ(Philip Kotler, 1931~) ڿ 2017 쳽 4.0(market 4.0) ߽ϴ. Ҿְ Ű ؼ 忡 ƴ ̷ ϴ ֽ Ʈ带 ʿ䰡 ֽϴ. Ϸ簡 ִ ϰ ÷ 谡 ϴ. ٸ ߿ ̽ Ȥ ׳ ϰ, ڽŸ ִ Ű ְ DZ ٶ ϰ ߽ϴ.