It is by definition an anti-trust situation. Any car company could have a monopoly on their car's brand distribution.

I am not defending the auto dealerships. I think their days are numbered and they will be put out of business. I am long Tesla stock. I am merely pointing out their perspective. There is plenty of anti-trust precedent regarding manufacturers competing unfairly with retailers.

Movie studios and movie theaters.

http://en.wikipedia.org/wiki/United_States_v._Paramount_Pict....

Standard Oil http://en.wikipedia.org/wiki/Standard_Oil_Co._of_New_Jersey_...

Just google Sherman antitrust act.