❑ Who is the first Economist the world has ever known? Who are the Economists Among us? What is the major and universal economic condition/problem that they had discovered in the world we live in, and made us aware of it? It has consequences, what are they?❑ Economists shape & share their minds with some major economic concepts and ideas that only belong to them that shared with the world. What are they? Opportunity cost is one of them. How to calculate correctly your opportunity cost for any choice of yours like you never seen before?❑ Finally, they struggled to define Economics and still disagreed on a universal one definition. However, they agreed to study it in two different branches as you will see. What is our text definition for Economics and how Economists explained the difference between Microeconomics and Macroeconomics?