{
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  "formats": "Every page has two versions with the same data: JSON (the page address + .json) and markdown (the page address + .md). Append .json or .md to any `url` in this document.",
  "title": "Angel Customers & Demon Customers",
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  "description": "One of the oldest myths in business is that every customer is a valuable customer. Even in the age of high-tech data collection, many businesses don't realize that some of their customers are deeply unprofitable,...",
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      "subtitle": null,
      "url": "https://www.bookquiver.com/larry-selden/angel-customers-demon-customers/9781440626715",
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