Taken from Wikipedia 

Wage Labour and Capital is an essay on economics by Karl Marx, written in 1847. This book has been widely acclaimed as the precursor to Marx’s important treatise Das Kapital.

Some of the main topics that the book examines are about labour power and labour, and how labour power becomes a commodity. It also presents the Labour Theory of Value that further develops the distinct differences between labour and labour power. The book also examines the commodity and how the economic principles of supply and demand affect the pricing of certain commodities. Beyond that the book explores how capital and capitalism do not service any purpose other than to gain more of it, which Marx presents as an illogical method of living one’s life.

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Wage Labour and Capital