Train Collector Jack McCoy Has Decided to Open a Store

Multiple Choice

Train collector Jack McCoy has decided to open a store that sells train memorabilia. After 18 months in business, he has noticed most of his sales are to the same small group of customers (about 40 people) , even though records show there are over 200 active train collectors within a 80-kilometre radius of the store. Which of the following does this retailing experience support?

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