This document discusses how to assess threats from new competitors offering free products or services. It provides guidelines for determining if a free entrant poses a minor, delayed, or immediate threat based on comparing the growth rate of the entrant's users to the defection rate of the established firm's paying customers. The document also outlines some strategies incumbent firms can use to offer a better free product, such as bundling it with paid offerings or charging third parties for access to users. It notes obstacles like profit expectations and accounting systems that may make these strategies difficult for incumbents.