Now it's dependent on some unclear factors regarding ability to make them yourself - but I suspect no one has any idea how to estimate what the result will be.
When using a Power, it's important to know how many of each we're going to get to know whether it's worth using the Power or not.
But also with Artifacts ... while not as costly as using a Power, it's very disappointing to get results as I just did when using a Market Raid artifact on a market with Metal Pipe, Thorium Bar, Metal Sheet & Copper Bar, and receiving:
0 Metal Pipe
0 Thorium Bar
0 Metal Sheet
576 Copper Bar
It's based on how much you can create within a certain time frame. The power uses a 1-day time frame, times the number of smelters/crafters you currently have, to calculate the amount you get, which I believe is somewhat random if more than one product in the market you're raiding is made by the same type of machine to smelt/craft the product. The artifact you used seems to give you 4% of what the power gives you, which would be about an hour's worth. Iirc, I think I have had something similar happen to me, and I think the artifact takes into account either if you have gotten the recipe on the map prior to using it or if you are actively smelting/crafting those items. The latter I can confirm is not true with the power, as I just used one I picked up and it gave me what I expected, despite not currently making some of them.