Thanks for the advice, but homework is not required to post in these forums. If it were, forum posting would decrease by at least 95%...
Please consult your dictionary for the meaning of monopoly. It means exclusivity. Since several cable companies plus Fios offer EI, it is not exclusive and therefore not a monopoly. And Dish could have it too, but the price is too steep for Charlie.
If cable companies can afford it, then why not Dish? Because Charlie offers a substandard product because he won't negotiate HD rights with several of the RSN's and he knows he will be unable attract enough subscribers.
He gets away with the substandard CI broadcasts because it is cheaper than EI and he doesn't need as many subscribers to support it.
Just my humble opinion, offered without doing any homework...