Could you please help understand what exactly happened in tackling corporate structure vs market structure?

As always love the way you build up the story and this story on visa is right up there. Thanks a lot Marc

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Marc, could you please explain this part more? “As well as his regret that merchants, and even cardholders, never got direct access to the system, he raises concerns about Visa's duopolistic position.”

I’m sorry, I don’t follow what it means to have “access” and “duopolistic” position?

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