Two neighboring cavemen, one doesn’t like going on mammoth hunts but is really good at sharpening stones.
There was no such thing as "neighboring cavemen," like you have neighbors living in personal, separate houses today. Perhaps you've been watching too much of the Flintstones. And it doesn't matter whether you "like" going on mammoth hunts. You hunt, and you gather, or you die. Again you're imposing a contemporary background of abundance on an ancient environment of scarcity.
The former is sharing, the latter is trading. And again, there's no evidence that trading ever occurred in that situation. As another commenter mentioned, in the life-or-death scarcity of hunter-gatherer communities, you'd be punished or exiled (which would mean death) for modern capitalist-style selfishness. There's no commodification.
Also, knowledge and skills were shared. There were no trade secrets, no patents. It would be have been extremely dangerous for one person to be the exclusive source of an essential good. Again, specialization is a luxury of abundance.
In a hunter-gatherer context, the men are hunting, fishing and fighting, while the women forage and manage the children.