whenever they walk past a resource tile they collect the resource this is stone and this is wood so there are two kinds of resources and then the last actions the agents have is building a house one wood and one stone will create one house and the house gives you coins so this is a house and that will give you coins but how much coins you get is different from agent to agent and this represents the agent's different skill levels this is an abstraction and the kind of economic theory behind it is that the income inequality in people