The Importance of Productivity in Agriculture

There is nothing that says the moment you take to agriculture, that your productivity will be high enough for you to have not everybody to have to work it farming. For example, in the South East Asia, there are people who have been farming tarot and other tuba around for a very long time but that does not lead to the kind of productivity that cereal gives. It's almost seems as if once you have the climate changing after the glacial age, a meherger is inevitable - from there eventually her urban civilization is inevitable. There are lots of important troubles. There areLots of luck, so to say, there is need for this to happen in that way.