21. Planned obsolescence tends to work best when a producer has at least an oligopoly . 22. Their markets are mostly oligopoly with intensive competition. 23. Later, some market models were built using game theory, particularly regarding oligopolies . 24. Cut off from the world, big companies devoured each other, creating cumbersome oligopolies . 25. Within the world of policy, they form a very tight oligopoly at the top. 26. An oligopoly in waste will naturally extend itself over recycling and put the brakes on. 27. Eventually a few new oligopolies will emerge. 28. Enforcement of laws meant to curtail monopolies and oligopolies , including mergers of supermarket chains. 29. The Hollywood oligopoly replaced the Edison monopoly. 30. On the other side, people suspect collusion and blame oligopoly and lack of reinvestment.
