The higher the technology of production of food and security and the higher the cooperative relationship among human beings in the production of food and security and in the reproduction of the human species, the higher would be the push and pull factors in the migration and concentration of human beings in towns and cities.
Mida kõrgem on toidutootmise tehnoloogia ja turvalisuse tase ja mida tihedam kooperatiivne suhe inimeste vahel tagamaks toidu, turvalisuse ja reprodutseerimise, seda tugevamad on tõmbe- ja tõuketegurid linnadesse rändamiseks.