Emile Bouvier, in his economics textbooks , has developed a very interesting educational tool , the "pipeline" of the economy. I received directly from him his teaching at the University of Sherbrooke in my ungraduated classes going for my Master.
This diagram shows the national accounts in the dynamic form of a network of five tanks: GDP , NDP , NI, PI and DPI with all the pipes that allow communication between these reservoirs. Are added two great pumps: the government and the investment.
This is the diagram of the national accounts or the pipeline of the economy:
Before studying the pattern of the national economy.