The starting point for understanding money is in understanding how people are motivated to use it. This was explained by Milton and Rose Friedman, in their l980 classic on economic liberty, "Free to Choose," in which they describe some of the ways that people spend money. One way is - You spend money on yourself - You are motivated to get the thing you want most at the lowest price. This is the source of what I like to call "Bazaar Negotiating." ERP software can help you make the best choices but if the system is not followed you get Erp Mrp Software.