http://mentalfloss.com/article/33637/best-shots-fired-oxford-comma-wars
The Best Shots Fired in the Oxford Comma Wars
BY ARIKA OKRENT
JANUARY 22, 2013
The Oxford comma, so-called because the Oxford University Press style guidelines require it, is the comma before the conjunction at the end of a list. If your preferred style is to omit the second comma in "red, white, and blue," you are aligned with the anti-Oxford comma faction. The pro-Oxford comma faction is more vocal and numerous in the US, while in the UK, anti-Oxford comma reigns. (Oxford University is an outsider, style-wise, in its own land.) In the US, book and magazine publishers are generally pro, while newspapers are anti, but both styles can be found in both media.
The two main rationales for choosing one style over the other are clarity and economy. Each side has invoked both rationales in its favor. Here are some quotes that have served as shots exchanged in the Oxford comma wars.
Pro: "She took a photograph of her parents, the president, and the vice president."
This example from the Chicago Manual of Style shows how the comma is necessary for clarity. Without it, she is taking a picture of two people, her mother and father, who are the president and vice president. With it, she is taking a picture of four people.
Con: "Those at the ceremony were the commodore, the fleet captain, the donor of the cup, Mr. Smith, and Mr. Jones."
This example from the 1934 style book of the New York Herald Tribune shows how a comma before "and" can result in a lack of clarity. With the comma, it reads as if Mr. Smith was the donor of the cup, which he was not.
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