A simpler word could have been "broker". A broker-less market is feasible as long as the producer and consumer don't need a platform or middleman to conduct their transaction. A farmer's market is an example, where buyers go to a farm and buy directly from the farmer. But then people wanted to consume stuff that is not produced locally. The supply chain is born.

Solution? remove the supply chain and consume local.

We tried that. Northern people sometimes starve in the winter, and people in arid locations starve during droughts.

Then the Babylonians invented supply chains.