In this clear and informed guide to the business model that’s set to dominate twenty-first-century commerce, Adam Levinter makes a compelling case that the phenomenal success of companies like Amazon, Netflix, Spotify, and Salesforce wouldn’t be possible without the foundation they all have in common: subscription. A surge of subscription boxes in 2012 earned buzz for offering everything from razors to meal kits to underwear; since then the model has proven to be adaptable, profitable, and...