That assumes that the costumers are long term thinkers and has Perfect Information Syndrome.
And that a corporation in the wild are never prone to create cronyism, in particular if they're the biggest one around the block.
And a government monopoly company is the most trustworthy company in Sweden (Systembolaget, our alcohol controlling company). Privatisation there would almost certainly decrease quality, since focus and size are extremely important factors in that service.
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