Catatonic
Nine Lives
The majik number is 3.You realize that if there were more competitors in the field ups would have a problem. You ever notice that when are wages go up they raise the price of shipping their packages. If amazon gets in the shipping business ups is going to have a serious problem.
1 is a monopoly
2 is a semi-monopoly
3 or more is an oligopoly.
I use to manage my own stock/funds.
I would look at a rising industry and if there were 2 major players that was a plus because their Op Margins were typically higher.
If a third player enters an industry, that is the time to sell because that will driver the margins down and consequently the price per share.