Why not use an actual real example instead of a fantasy of infinite socks? And you bind your concept of "morally just" to cost.

What if it cost $.05 to copy? Why is moral and just (related but not equivalent) bound to cost?

As to a real example: a professor of medieval history has incurred the cost of his education, including reading handwriting in a foreign language, the cost of time, effort, travel and more in researching and writing and has now typed up a book on his computer and it is "free"[1] to distribute so it's morally just to give a copy to all who want it?

You pretty much cloaked your greed in a word salad of meaningless moralizing with a jargon dressing and no real context.

[1] Even digital requires the cost of equipment, electricity, and access, so if you bind morally just to free it doesn't exist.