Many of America’s most successful companies can credit part of their strength to great customer service. Apple (AAPL) is highly regarded for the way it treats customers, both at its retail outlets and its website. Southwest (LUV) — the most financially successful airline in America — routinely gets the best customer satisfaction grades, and in an industry that is known for poor customer treatment. Netflix (NFLX), which has taken substantial revenue from cable companies and telecom providers, gets among the highest ratings in the well-regarded American Customer Satisfaction Index, released by the University of Michigan.

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