Not all building powers can be replicated perfectly. Doing the same steps as above for transposing the Market's functions and powers to a "Procuratorate" building, we found that you cannot copy the Market's buy/sell resources function. The Procuratorate can be built just like a Market can, and it can create Caravans and Merchants, but there is no buy/sell interface.
From a purist's viewpoint, this is a problem. But from a rationalist's viewpoint, this actually lends itself rather well to making a Communist nation in the game. Economic inflexibility has long been a historical problem for communist and socialist nations, so it sort of makes sense that their Market type buildings would be a little weaker. If you're playing as Communist China or the Soviet Union, you must actually collect the resources you need. You cannot simply trade for them at the Market.
Screens follow, showing the new Procuratorate building and its inability to buy/sell resources.