Stew Leonard, the owner of a highly successful regional supermarket chain, reacts adversely to losing a single customer sale. He feels that this amounts to losing the entire stream of future purchases that a customer is likely to make if she remains in the area. Stew Leonard's concern is an illustration of which of the following?
A) share of customer
B) market share
C) partner relationship management
D) customer lifetime value
E) market share maintenance
Answer: D