Source: Bigstock and Subscription Insider

I've often talked about the importance of recurring revenue in this space, for example, in my columns here and here and here. But subscriptions are not the only way to achieve recurring revenue. A favorite example of business school profs is the razor-and-blades model. Sell customers a razor at cost, and make your money on the recurring purchase of blades. The BBC's Tim Harford recounts the origin story of the business model: King Camp Gillette invente...