They have 4 brands (chevy,GMC,buick,cadillac) The whole thing is more work than necessary. Why not follow the Japanese way and cut it down to 3 or less brands and simplify the whole product lines. Toyota has Lexus for its high end and toyota for its regular line of automobiles. The whole line up is simple, same with Honda which has Acura/Honda. GM needs to simplify its line up if it wants to improve earnings and efficiency.