[Shawnee123]

Source: U of NC.edu

5. X,Y, and Z
Put commas between items in a list. When giving a short and simple list of things in a sentence, the last comma (right before the conjunction–usually and or or) is optional, but it is never wrong. If the items in the list are longer and more complicated, you should always place a final comma before the conjunction.

EITHER: You can buy life, liberty, and the pursuit of happiness in Los Angeles.
OR: You can buy life, liberty and the pursuit of happiness in Los Angeles.

BUT ALWAYS: A good student listens to his teachers without yawning, reads once in a while, and writes papers before they are due.
So, as stated, commas are optional in a list and it is correct to do either (of course depending on source.) I just think it makes more sense: Verbally "You can buy life...libertyandthepursuitofhappiness in Los Angeles." Why set libertyandthepursuitofhappiness apart from life as if it is a single entity?

Just my humble op!