"One study found that, in business-to-business companies, the top 20% of customers are generally responsible for 150%-300% of total profits, while the company breaks even on the middle 70% of customers and the bottom 10% of customers cause losses. Similarly, a multi-industry study by McKinsey & Co. found that bad customers might account for 30%-40% of a typical company’s revenue.
As an illustration, we provide the cumulative profits curve at a bank with which the second author has worked. This type of curve is often referred to as the “whale curve” [Moi ici: Ou curva de Stobachoff] because of the profit curve’s humpback, inverse-U shape. In this bank’s case, about 50% of customers contribute negatively to profits. In fact, the top 5% of customers contribute almost 75% of the bank’s profits."
Trecho e figura retirados de "Should You Punish or Reward Current Customers?"