Train Collectors Jack McCoy and Sandro Dias Have Decided to Open

Multiple Choice

Train collectors Jack McCoy and Sandro Dias have decided to open a store that sells train memorabilia-everything from toy train sets to full-sized railroad signs.After 18 months in business,they have noticed that most of their sales are to the same small group of customers (about 40 people) even though they have records to show there are over 200 active train collectors within a 50-mile radius of their store.Their retailing experience is supportive of which of the following?

A) the rule of demand
B) the 80/20 principle
C) the optimizer principle
D) the min-max rule