This is a powerful novella exploring the theme of what it means to be human, and what cultural conflicts may arise when we start to become more. It's a very quick read, and extremely well written, so I definitely recommend it!
Here's an excellent quote. It's toward the end, but doesn't spoil the plot.
Trade isn't always linear. You missed that. If Stewart gives me something, and I give Stella something, and ten years from now Stella is a different person because of that and gives something to someone else as yet unknown—it's an ecology. An ecology of trade, yes, each niche needed, even if they're not contractually bound. Does a horse need a fish? Yes.