regarding why some would give up hunting for farming and settle onto "property": Beer. Really. To produce beer you had to settle down in one spot for quite some time. Once the growing and technology were figured out, making beer was a very profitable occupation. But it meant a complete change in lifestyle. The nomadic life of the hunter had to give way to the settled life of the farmer. And "his" land. (provided of course, he made free deliveries to the local chief). It all sounds too simple to be believed, but beer making actually did help change man from the hunter to the farmer...and that changed everything.