You have a fixed amount of already acquired property
You do specified labor on that
You exchange your labor + property for someone else’s labor + property
That’s commerce and has nothing to do with the question I’m talking about, which is: How you acquired the property in the first place is the ethical question.
What’s unethical is if your a neighbor was struggling to survive and instead of caring for him out of your property and labor, you convinced him to trade your excess money for a portion of his property in perpetuity.
So no, there is no more uncaptured “pie.” It should have never been caputured in the first place - it’s equally everyone’s right
But if we're considering utility-- how useful stuff is to me-- it is far from zero sum.
If I produce lots of wheat, being able to trade some of it for my neighbor's beef makes both of us richer.