Amazon is building a bigger collection of subscription options under its Prime subscription program, including The Subscription Box store. According to Modern Retail, presence on Amazon gives brands with existing subscription services a way to reach more potential customers. Within Amazon’s 100-million-person strong Prime subscription program is a burgeoning collection of sub-subscriptions: a collection of product replenishment models that build repeat purchases and recurring revenue into Amazon’s bustling ecosystem... And speaking of Amazon: The company has opened a second Amazon Go store in New York City, a month after opening its first Manhattan location. CNBC says the cashierless concept has grown to 13 stores, and the e-commerce giant is reportedly planning to open as many as 3,000 by 2021...