Serial Comma

I believe this is called an oxford comma as well.

I use it all the time. Highly recommend it. Note: I've seen plenty of decks/CIMs with the oxford commas thrown in.

There is no harm in using the oxford, just be consistent. I always use the oxford

i like the oxford comma, but an associate railed me for using it in some deck this summer. bankers are picky for no fucking reason, so i'd stick to no comma, specially since it's more common than the oxford.

I prefer to use the Oxford comma. Once had my team sit down and have a quick discussion about whether or not to use it throughout our deck. We opted to use it, but consistency is the most important thing.

I'd assumed that was the correct way...

I always thought it depended on the circumstance. Like if the last two items on the list were more related than the others, use no comma. An example escapes at the moment. Otherwise, use the Oxford comma. I suppose I could be wrong though. Can't go wrong with consistency. Everyone has their preferences. We're not English majors after all.