Imagine you run a global media conglomerate. Say you’re Robert A. Iger, the chief executive of Disney, or Brian L. Roberts, of Comcast, or perhaps you’re slightly lower down on the ladder of behemoths — the boss of Twenty-First Century Fox or Time Warner, perhaps. In any case, you own a lot of valuable stuff: movie studios, broadcast and cable TV networks, perhaps a broadband infrastructure, maybe some theme parks with roller coasters and a few impressive castles. So here’s a question for you, my media-mogul friend. How worried are you about Netflix? And more to the point: Are you worried enough? It’s possible you’re not. Yes, Netflix has grown substantially over the last few years, now claiming more than 70 million subscribers who pay about $8 to $10 a month for access to a large library of movies and TV shows. Last year the streaming service’s stock was the best performing of the Standard & Poor’s 500-stock index, rising 140 percent.

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