noun
principles of economics
Academic term for a foundational economics course or textbook covering basic principles.
大学で経済原論を履修した。
I took Principles of Economics at university.
経済学 is the general field of economics, while 経済原論 specifically refers to the foundational principles or an introductory course.
Compound of 経済 (economy) and 原論 (fundamental theory). The exact historical derivation is uncertain; the term is conventionally used in academic contexts.