When Amazon bought Whole foods, an upscale grocery store chain. Other firms shuttered. The spread of Amazonian tentacles ai worrying to those weary of concentrated corporate power. Shoppers however find lower prices now compared to before Amazon bought the grocery chain. In a commodity market there is a monopoly when there is not enough allowance for competition. Outside of a commodity market it is not straight forward how to define a Monopoly. Antitrust regulators. The less competition that exists in an economy then the more likely existing firms are to price markup. In 1980 firms charged an average of about 18% markup over price of production. Today firms charge an average of about 67% markup over price of production. In some industries such