Hi all. Tell me who knows how to make an adequate economic system for the prices of game items? What should be the price of each item? Or, for example, converting any loot into scrap metal in order to roughly understand the value of the item.

I would start by looking at the relative scrap cost to craft, and what a recycler would provide.  Something in that range of those two extremes, as well as the scrap cost to buy.

After that, it's up to you.  I imagine you would collect data to see what items are being purchased the most/least and adjust those prices.