Yes, giving a name to something that already exists but was previously undescribed means inventing it out of the aether,
even when you weren't the one to name it. Karl Marx was a revolutionary too, and all he did was define pre-existing trends in ways nobody ever had before and make a prediction as to where they would lead. That doesn't mean the things he named didn't exist before he named them.
The terms and the concept still function in a mercantile system, and they function in any economic system which has diversified beyond tribute or gift economy. There are still supplies, there are still demands. Who is demanding or supplying them, what they are demanding or being supplied, and how the market is established or operates is rather quite tangential to the point of both factors being required for the existence of trade.
Trade exists without governments. It will occur whether governments interfere or not. It can be assisted or hampered by governments, however, and governments will involve themselves in it because they stand to gain from doing so. None of that means it is solely directed by governments, in case we have forgotten Guilds or things like the Silk Road or Red Sea trade, most of which involved, yes, small groups in caravans or convoys out for profit, and which were only occasionally maintained by the governments in question directly, mostly to secure greater profit.
This is all ignoring such anachronisms in the current system as Ethiopia trading with Muscovy in the 16th Century.
North King said:
Obviously Tawantinsuyu and the Kongo Kingdom aren't going to trade by the Silk Road, but that doesn't deny the existence of the Silk Road.
Yes, because China, the Central Asian Nomads, Persia, India, and the Ottomans all got together and decided to build and maintain a trade system sending goods West to get rich. It didn't occur as a result of individuals or groups wanting to get rich and then the government noticing and deciding that such a stable revenue system should be protected. Most definitely not.
They all signed Trade Agreements with
Byzantium Poland-Lithuania and Genoa and spent EP on projects to construct it.