After rumors broke late last night, Comcast announced this morning that it had reached an agreement to acquire rival Time Warner Cable in a deal worth around $45 billion. The news brings months of machinations to a close: Comcast ended up besting the efforts of the much smaller Charter Communications, which had been trying to advance its own hostile takeover of Time Warner as recently as yesterday. But with the prospect of a combined Comcast and Time Warner on the horizon, the question turns to what a merger would actually mean — both for consumers and the industry at large. Comcast is already the largest cable and internet provider in the United States, with 21.7 million television and 20.6 million broadband subscribers to its name.