Many large corporations, such as General Motors and Apple, operate in markets that are not even close to perfectly competitive. But unlike the products these companies sell, shares of these firms' common stock are bought and sold in what could be described as a perfectly competitive market. Based on the three conditions that make a market perfectly competitive, what characteristics of the purchase and sale of shares of stock of a large company like GM or Apple, are consistent with perfect competition? ( provide academic journal articles to support your answers.)