Industrial relations has its roots in the industrial revolution which created the modern employment relationship by spawning free labour markets and large-scale industrial organizations with thousands of wage workers. As society wrestled with these massive economic and social changes, labour problems arose. Low wages, long working hours, monotonous and dangerous work, and abusive supervisory practices led to high employee turnover, violent strikes, and the threat of social instability. Intellectually, industrial relations was formed at the end of the 19th century as a middle ground between classical economics and Marxism, with Sidney Webb and Beatrice Webb's "Industrial Democracy" (1897) being a key intellectual work. Industrial relations thus rejected the classical econ.