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