Market/Price Mechanism was recognised as invisible hand by Adam Smith. The phrase invisible hand was introduced by Adam Smith in his book 'The Wealth of Nations'. He assumed that an economy can work well in a free market scenario where everyone will work for his/her own interest. He explained that an economy will comparatively work and function well if the government will leave people alone to buy and sell freely among them. He suggested that if people were allowed to trade freely, self interested traders present in the market would compete with each other, leading markets towards the positive output with the help of an invisible hand.