Some cases may be more extreme—the most profitable 20 percent of customers (on a per capita basis) may contribute as much as 150 percent to 300 percent of profitability.
The least profitable 10 percent to 20 percent, on the other hand, can actually reduce profits between 50 percent and 200 percent per account, with the middle 60 percent to 70 percent breaking even.16 The implication is that a company could improve its profits by “firing” its worst customers.
It’s not always the company’s largest customers who yield the most profit. The smallest customers pay full price and receive minimal service, but the costs of transacting with them can reduce their profitability. Midsize customers who receive good service and pay nearly full price are often the most profitable.