I call it the yahoo fenomena. buy a lot of stock on number one (google, or Amazon in this case), then use your money or previous position on number two or thre

I call it the yahoo fenomena. buy a lot of stock on number one (google, or Amazon in this case), then use your money or previous position on number two or three company in the same market to influence the board to drive the company value to the ground. now you can claim loss on the secondary position while creating a bigger monopolistic market for your main position for the long run.