Car dealerships: although even that has changed over the years, with many dealers selling two brands (often one American; one foreign)
Fast food restaurants -- e.g., McDonald's sells only its products, except for the branded drinks
Service (gasoline) stations ...
... and then it starts to get difficult .... even Firestone sells non-Firestone tires ... Sears appliance stores? I don't know; I haven't been in a Sears appliance store in years ...
Apple -- one brand .... (yes, Apple stores do have some non-Apple brand accessories, but very, very limited in scope; much like branded drinks in fast food restaurants)
Ikea -- selected non-Ikea brand accessories, again
Telecom -- one branded spectrum (ATT, Verizon, Sprint), but multiple cell phone brands
Obviously I am not including the outlet stores seen in a few locations around the US.
I started thinking about that in view of John C Dvorak's recent column and while reading the bio of Steve Jobs, a Christmas gift from my wife. How far could Apple expand its product line?
