The text of "Wage-Labour and Capital" came from lectures Marx delivered to the German Workmen's Club of Brussels in 1847, a time of great political upheaval. The relationship between wage-labour to capital is a core concept in Marx's analysis of political economy. This book is an essential, a foundation to understanding the development of Marxist theory. "Price, Value and Profit" was written in 1885, The different parts in the title decomposes into the basic Marxist theory of the 'surplus value of labor' (one of the three essential building blocks of Marxism). These books, again, are the basic foundations to understanding the development of Marxist theory. As valid today as in the late 1800's. A Collector's Edition.