we can easily display the effect of including a lot more of a variable source, say labor, to a set number of money and see what comes about to output. For demonstration reasons in economics, we often make widgets, which https://www.youtube.com/watch?v=-nQTR6bXhfU&list=PLZ3DkIWtVYetfvXsAvY04--yisQJg2WWI&index=9&pp=iAQB