获取App的历史价格和对应销量，分析人们的心理价位。 市场上已有的服务有（提供 App 历史售价）： - AppZapp - Price Tag 参考资料： - [http://apple.stackexchange.com/questions/5257/history-of-version-price-changes-for-itunes-apps](http://apple.stackexchange.com/questions/5257/history-of-version-price-changes-for-itunes-apps) - [http://www.appcorner.it/en/service.html](http://www.appcorner.it/en/service.html) - [http://stackoverflow.com/questions/5604886/how-to-get-info-from-the-apple-itunes-app-store-and-mac-app-store](http://stackoverflow.com/questions/5604886/how-to-get-info-from-the-apple-itunes-app-store-and-mac-app-store)
