Sources of food



Authority
						- work tasks are allocated to each person 

						- generally some trade with people in other places for

						  essential supplies (fuel, clothes etc)

						- own activities for growing food, building, etc.


	person 1

		|
		+------> person3
		|
		+------> person4
		|
		+------> person5
		|
		+------> person6





Commerce


								- each person produces something, then trades with others

								  to obtain other things

									
								- the general system at most times in history


								- a complex system requiring a high level of knowlege by each 

								  person involved in it

			person 1	person 4

			    |	\       /
			    |	 \     /
			    |	  \   /
			    |	   \ /
			    |	
			    |       person 3
			    |      /
			    |	  /
			    |	 /
				/
			person2		etc.






War/attack



	person 1  --------->  person 2






Collection from nature


	fruit from trees, etc.




individuals


	services in exchange for fees, employment


