Carl Menger played a pivotal role in the history of economic ideas. With this treatise, he simultaneously established himself as the founder of the Austrian School as well as a leader in the Marginal Revolution - one of the most important events in economics. Although Menger completed this book in the early 1870s, his contributions to subjective value theory, price formation, methodology, and time economization remain relevant even today. Anyone interested in economics should definitely pick up a copy.