How does the dual market work for cable-network owners?

This is for a Journalism Economics class. How does the dual market work for cable-network owners? (If you’re not sure what a cable-operator is, go here… http://en.wikipedia.org/wiki/Cable_television). Also, how does the Internet threaten the cable-operator’s dual market? Finally, economies of scale occur through vertical integration; how do cable operators benefit from vertical integration? Please don’t forget to mention primary and […]