Only in zero sum. I don't think many things are really zero sum. The reason why both parties say thank you in a financial transaction is because the first party values the thing more than the money and the other party values the money more than the thing. Win-win.
I prefer winning as a team. I also like significantly contributing to that, but never at someone else's expense. I am the first to say "we did this" vs "i did this."
I had a boss that authored a book on how to use some of our software. It was a good book, and he busted his ass, writing it (alone).
His bosses made him completely remove any mention of his name.
I feel that was going a bit too far, but I understand why.
They used to say "The nail that sticks up, gets hammered down."
The Japanese have the strongest teams I've ever seen, but it is difficult to get individual recognition.