The document discusses different monetization strategies for mobile apps, including free with advertising, paid downloads, and hybrid models. It notes that while most downloads are from free apps, most revenue comes from paid apps. However, many paid apps generate little revenue. Therefore, the document recommends a free, ad-supported app with optional paid add-ons or services to maximize both exposure from free downloads and revenue from within-app purchases. It provides an example of an app that was both a top free download and generated significant revenue per user through this hybrid model.