Serial Comma Pros And Cons
Sep 10, 2014 Pros of Using the Oxford Comma. Any person in academia should take note: The Chicago Manual of Style, Modern Language Association, American Medical Association, and others recommend the Oxford comma because it clears up ambiguity and makes lists easier to understand. The hipster band Vampire Weekend has a catchy song called “Oxford Comma”.
First things first: what is the Oxford comma? Also called serial comma, it is a comma placed after the penultimate item in a list and before the conjunction “and” or “or.”
Here’s a sample sentence without the Oxford comma:
We traveled to China, Thailand and Japan.
And here is the same sentence with the Oxford comma:
We traveled to China, Thailand, and Japan.
The Oxford comma is the one after “Thailand.”
There is a hot debate around its use because this is technically an optional punctuation mark, and in some sentences it clearly helps understanding and removes ambiguity while in others it can be redundant. (Wikipedia has a list of arguments for and against the Oxford comma.)
Making things worse, this punctuation device can sometimes have serious business implications. In 2017 a company settled for $5 million with its drivers because the absence of the Oxford comma in the law text created ambiguity about overtime compensation.
Author Lynne Truss once wrote: “There are people who embrace the Oxford comma, and people who don’t, and I’ll just say this: never get between these people when drink has been taken.”
Below you will find a compilation of opinions and recommendations from publications and style guides, so that you can decide for yourself whether or not to use it.
In favor of the Oxford comma
Maeve Maddox (English Ph.D. and DWT writer) (link)
After a lifetime of being wishy-washy about the serial comma, I’ve reached a decision: I’m going to use it all the time. Such a momentous decision is, of course, a deeply personal matter. The pros and cons are widely, frequently, and hotly debated.
My choice is to travel the path of otiosity for the sake of uniformity.
Mark Nichol (UC Berkeley instructor and DWT writer) (link)

I strongly favor the serial comma. Why?
In a sentence such as “I bought one apple, two bananas and three oranges,” no ambiguity exists. But in “I ordered ham and eggs, toast and jam and pie and ice cream,” the cavalcade of conjunctions gets confusing, and in contexts in which it’s not as clear which list items might be distinct and which might be linked, the absence of the final comma might require readers to reread the sentence to establish the organization. So, the solution in this case is to use a serial comma when confusion could arise.
Mary Cullen (Business writing instructor)
I recommend using the serial comma in business writing, since it is the customary convention. And, to me, it is much easier to consistently follow this convention, than to omit it most of the time and add it in when clarity is needed. Keep it simple.
The Chicago Manual of Style
When a conjunction joins the last two elements in a series, a comma—known as the serial or series comma or the Oxford comma—should appear before the conjunction.
The Elements of Style
Serial Comma Pros And Cons Worksheet
In a series of three or more terms with a single conjunction, use a comma after each term except the last.
MLA Style Guide (link)
Fair-weather comma users: publications that do not require the serial comma may use it only when misreading results. Proponents of the serial comma, like the MLA, would decry the inconsistency of the use-it-when-you-need-it approach and advocate using the serial comma in all series of three or more items or phrases.
Grammarly
Unless you’re writing for a particular publication or drafting an essay for school, whether or not you use the Oxford comma is generally up to you. However, omitting it can sometimes cause some strange misunderstandings.
Against the Oxford comma (with exceptions allowed)
Associated Press Stylebook
Use commas to separate elements in a series, but do not put a comma before the conjunction in a simple series. Put a comma before the concluding conjunction in a series, however, if an integral element of the series requires a conjunction:
I had orange juice, toast, and ham and eggs for breakfast.
The New York Times style guide (link)
Style guides for book and academic publishing generally would insist on another comma after “pears,” the so-called serial comma or Oxford comma. But news writing has traditionally omitted the serial comma — perhaps seeking a more rapid feeling in the prose, or perhaps to save time and effort in the old days of manual typesetting.
We do use the additional comma in cases where a sentence would be awkward or confusing without it: Choices for breakfast included oatmeal, muffins, and bacon and eggs.
University of Oxford stylebook (link)
Note that there is no comma between the penultimate item in a list and ‘and’/‘or’, unless required to prevent ambiguity – this is sometimes referred to as the ‘Oxford comma’. However, always insert a comma in this position if it would help prevent confusion
Canadian Press Stylebook
Put commas between elements of a series but not before the final and, or or nor unless that avoids confusion.
Penguin guide to punctuation
Note also that it is not usual in British usage to put a listing comma before the word and or or itself (though American usage regularly puts one there.) So, in British usage, it is not usual to write The Three Musketeers were Athos, Porthos, and Aramis.
Conclusion
This discussion has basically two camps: those who favor the universal use of the Oxford comma for the sake of simplicity and uniformity; and those who are against it, except when it is necessary to remove ambiguity.
DailyWritingTips.com favors the universal use of the Oxford comma.
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How do you feel about this sentence? We invited two investors, Warren Buffett and Bill Gross to our annual conference.
If you are confused about whether we invited a) just two people to the conference (Buffett and Gross) or b) four people to the conference (Buffett, Gross, and two other investors), then welcome to the debate over the “serial” or “Oxford” comma.
Financial writers like to debate whether to use the serial comma. We dive into this debate and explain why this controversial piece of punctuation is a valuable asset to your financial writing.
What Financial Writers Need to Know About the Serial Comma
The “serial” or “Oxford” comma is the punctuation that follows the final conjunction in a list of three or more things. As you can see, the italicized sentence above does not include the serial comma after “Buffett.”

This tiny mark sparks oversized reactions: people either love it or loathe it. It is fairly popular in the United States, but rarely used in the United Kingdom. The Chicago Manual of Style approves; the AP Stylebook shuns. My eighth-grade English teacher, Mrs. Albers, taught us to use it; my high school English teacher, Mrs. Purvis, taught us not to use it.
TEDTalks offers an amusing animated look at the serial comma’s pros and cons. A poll from FiveThirtyEight.com shows that Americans are roughly evenly split for and against the serial comma.
WFC's Take on the Serial Comma
At Wentworth Financial Communications, we are not ambivalent about the serial comma. We are strongly in favor of it. Why? Because, for example, by adding it to our sentence about the investors, Warren Buffett, and Bill Gross, it removes any confusion about how many people we are inviting to the conference.
We invited two investors, Warren Buffett, and Bill Gross to our annual conference.
Regardless of whether your firm uses the serial comma or not, one thing is not up for debate: you have to be consistent. You should either always use it or never use it.
At WFC, we help financial services firms and law firms improve their writing, regardless of whether they agree with us about the serial comma. To receive more writing tips like this, sign up for our monthly newsletter, Return On Content, or contact us (@WFC_Writing) to learn more about our approach to financial writing and financial services content marketing.
About the Author: Scott Wentworth is the founder and head financial writer of Wentworth Financial Communications. Over his nearly 15-year career as a marketing writer and ghostwriter for the financial services industry, Scott estimates that he has used approximately 98,125 serial commas in white papers, newsletters, blogs, (make that 98,126!) and other forms of content marketing that he has written for financial services firms and law firms.
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