NPV Product Viral 
Rob Go
MAY 26, 2016
The assumption here is that that increased value is NPV positive based on other potential uses of the capital that you could have gotten up front. The exception are recurring revenue businesses with an amazingly viral free product that very effectively get consumers to subscribe without needing significant marketing and sales expenses.
andrewchenblog.com
JANUARY 28, 2010
For freemium businesses, particularly ones that are social apps, there’s often a word of mouth or viral component, which we’ll cover in a second. Funnel Once you get your users registered onto the site, then there’s the question of how convert to paying customers, and whether there are any viral effects.
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