Karl Marx's main argument was that the owners of industry are eager to improve the way work is organised, to adapt to new tools , machines and production methods. According to Marx, profit causes capitalists to concentrate workers in large factories; keep wages low and invest as little as possible to improve working conditions. Marx's theory was more relevant than the other theorist; he was deep with capitalism. Many had found Marx's theory important, because they believed it had changed the course of history, which had a huge impact on society..