Along with Adam Smith, the Englishman David Ricardo is one of the fathers of the so-called Classics school of economic thought, and the Principles is his major opus, one he was very much reluctant to write, but only did so at the urgings of James Mill and his son John. Written in the first half of the 19th victorian century, he was nonetheless, a very freed mind, who did not accept or indulge in the extravagancies of the beginning of the industrialization proccess in England. To David Ricardo, Karl Marx owes a good share of his theory of labour, something essential in the labour movements of then. The concepts adapted and created by David Ricardo is transported to the text in a dry and concise style, not too much worried in polemics, but only interested in address the topics he raises in a very precise way. IF you are a student of Social Sciences, this book is a must.