we are able to demonstrate the effect of adding extra of the variable resource, say labor, to a set number of cash and find out what comes about to output. For demonstration functions in economics, we often make https://www.youtube.com/watch?v=-nQTR6bXhfU&list=PLZ3DkIWtVYetfvXsAvY04--yisQJg2WWI&index=9&pp=iAQB