Making "freemium" work
探讨了互联网和智能手机应用企业采用的免费增值商业模式，包括营销策略、升级生命周期及新企业应考虑的六个问题，并以NYTimes.com和Dropbox等公司为例。
The article discusses the business model which is used by some Internet businesses and smartphone application developers to give users free basic features of a digital product and access to premium functionality for a subscription fee. The discussion topics include the freemium marketing strategy, the life cycle of upgrades in freemium companies, and the six questions that new business enterprises should explore when considering the freemium model. The article mentions how four companies including NYTimes.com newspaper and Dropbox cloud storage use the freemium model.