*Note that there is a page on the guide devote to each sub-discipline.*
"The subject is normally divided into microeconomics and macroeconomics. In both branches, certain operating standards are pursued: theorizing, collecting and analysing facts, and then re-examining theory in the light of them. Throughout this (never-ending) process, economics is concerned to develop general propositions that can be applied in a variety of countries, periods, and circumstances and still hold good. That is why it claims to be a ‘science’, even though it is almost impossible to set up a laboratory experiment in the way that physical scientists can arrange every day."