1. 背景
empirical: 2000.10-2007.10, video game monthly sale
2. 目的
to understand the role of vertical integration in video game productionand eventually video game demand
3. 結(jié)論
vertically integrated games produce higher revenues, sell more units and sell at higher prices
most of the di?erence in performance comes from better release period and marketing strategies that soften competition（也可能是消除 contractual frictions in video game production）
integrated video games are inherently worse than independent games，——outsourcing innovation seems to be the way to conduct
research and other uncertain process that may drive costs up too high
exclusivity is associated with lower demand (和之前研究一致)
之前的研究是網(wǎng)絡(luò)效應(yīng)對(duì)平臺(tái)需求和競(jìng)爭(zhēng)的影響掷空，現(xiàn)在研究垂直整合的影響脖岛，可是垂直整合不會(huì)帶來網(wǎng)絡(luò)效應(yīng)的擴(kuò)大么恩溅？——Had network e?ects been absent, these ?ndings seem to indicate that this industry would be less integrated and more atomized than it is currently
