The document discusses several economic ideas that emerged during the Industrial Revolution, including laissez-faire economics advocated by Adam Smith. Thomas Malthus and David Ricardo built on Smith's ideas and believed that population growth would lead to a permanent underclass of poor workers with declining wages. Utilitarians like Jeremy Bentham believed the goal should be maximum benefit for most people. Socialists advocated public ownership of resources and factories to reduce inequality. Karl Marx proposed communism, with public ownership and no private property. Workers joined unions to advocate for better conditions.