"Principles of Political Economy" by Arthur Latham Perry is a textbook about history and political economy that covers the crucial subjects in the field, their influence, variations and definitions. The main subjects are: Value, Material Commodities, Personal Services, Commercial Credit, Money, Foreign Trade and Taxation This is the origin of the "Introduction to Political Economy," first published in 1877, twelve years after the other. Its success as a textbook and as a book of reading for young people has already justified, and will doubtless continue to justify in the future, the forethought of its promoters.