My comments are provoked by the reviews already posted with regard to the 18th Edition of Samuelson's text. I am an engineer by profession who in the latter days of his career has been teaching seniors in chemical engineering the elements of process systems engineering, which includes engineering economics. Samuelson, whom I greatly admire, has provided us with an approach to the complex and, given the present economic situation the world, and only partially understood science, if that is what is, of economics. But my true guide is John Maynard Keynes as expressed in his The General Theory of Employment,Interest, and Money. He, at least, recognized the psychological dimensions of economics, something that seems teo be lagging far beyond his times. And his counsel led us out of the Great Depression, even if it took WarII to do so. So, read Samuelson, but read beyond also.