You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who coined the phrase the customer is always right?" whose answer is Marshall Field.
Each document should contain about 30 words, and these documents should contain useful information.

Query: origin of the phrase "the customer is always right"
Useful Output:

Doc 1: “The customer is always right” is a well-known principle presented by retailer Marshall Field in Chicago in September 1905.
Doc 2: “The customer is always right” is a phrase pioneered by Harry Gordon Selfridge, John Wanamaker and Marshall Field.
Doc 3: As noted previously, in September 1905 newspapers in Boston stated that Marshall Field adhered to a principle of: “The customer is always right.
Doc 4: The most likely explanation is "The customer is always right" concept predated these quotes published in 1905. I tend to believe the longer
Doc 5: The Origin of The Customer is Always Right  The origins of this phrase date back to the 1900s. The phrase is currently credited to Harry Gordon