Detailed Instructions: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
Problem:Category: FAMILIAR PHRASES 
Clue: This 5-word rule or maxim has been attributed to both H. Gordon Selfridge & John Wanamaker
Solution:
the customer is always right