Where did humans become sedentary?

Along the ice line where seasonal change required hibernation.

And the isolation of the hoards required the shipment of goods between villages, the entrepreneur was born. In the Levant it appears around 10,000 BC; but it was imported from the north, folks migrating back south.

We are a 3D society because of the introduction of the third color, the pit boss. We do not do N-ary trades higher than three.