The meeting grounds for the exchange of food stuffs were called cities. It is likely not simply a coincidence that Neolithic man is credited with the beginnings of settled agriculture and also the building of the first towns. Jericho, one of the oldest towns in the Middle East, was first sustained by hunting, then abandoned only to return as the center of agricultural development. Incidentally, only as an agricultural settlement did the residents of Jericho find it necessary to build the walls that Joshua was so contemptuous of. While solving their problem of an appropriate amino acid balance by introducing animal husbandry into the agricultural mix, early Near Eastern societies had additional problems with small grain agriculture.
Small grains are a timely crop.
If left in the field too long it's lost from the harvest. A society successfully engaged in small grain agriculture has to develop a relatively accurate sense of time, and impose either upon itself, or accept the imposition from outside, the requisite discipline and order to make the system work. Also, small grain agriculture is particularly susceptible to brigandage. Unlike hunting, which can be done continuously and the product consumed immediately, small grains are harvested at a particular time and stored for future use. Protection of the settlement then, such as the walls of Jericho and the creation of an army for that purpose, is not an unlikely occurrence.