let's muster the militia for a Pax Social
since we know, a Pax Capital, will never happen.
We are trying to make pricing way too difficult. The idea of pricing a painting, the Mona Lisa, for instance, has little to do with pricing a manufactured desk. So, think for a minute.
A painting ia a one off thing, and the price you will start off with will likely be what you would think the value (price) would be for like paintings. And, you are not going to offer the item at a fixed price, because it is difficult to find the upper range the painting would sell for. So, you sell it via auction, and let buyers set the selling price. Labor costs has nothing to do with it, except to suggest there is probably a minimum price under which you would not sell the painting. So, maybe you start the bidding at $1M and let buyers bid the price up until time runs out. Then, the highest bid IS the price.
But if you are building some item and making ongoing copies, you need a fixed price. So, you establish the price based on what similar items sell for. You set the price, offer the items for sale, and see what happens. You may well need to adjust prices up or down depending on how many are sold. Basic considerations include costs of manufacture in materials and labor costs. You obviously have to meet some minimum price, or you have no market price that you can live with. So, over time, you adjust materials, labor, and profit expectation to reach a market price at which you sell your product. And, over time, you can determine if the market price to continue, or if you need to take the product off market.
But this is the same whether you are a socialistic economy, or a capitalistic market, or some combination. It is done all the time, is not a difficult issue at all. And, as said, whether the economy is socialistic or capitalistic, the decision making on pricing and productions are pretty much the same. Price is determined by buyers and sellers. Period.