1. Blake Droesch, “Which Subscription Services Will US Consumers Sign Up for Next?,” eMarketer, May 21, 2019,

2. Robbie Kellman Baxter, The Membership Economy: Find Your Super Users, Master the Forever Transaction, and Build Recurring Revenue (McGraw-Hill Education, 2015), 1–2.

Chapter 1: Welcome to the World of Forever

1. Michael Henage, “Apple’s Biggest Opportunity Could Also Be Its Biggest Problem,” Seeking Alpha, June 30, 2019,

Chapter 4: Define Your Forever Promise

1. The Editors of Encyclopaedia Britannica, “Charles Henry ...

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