A quick study of GM over the years from The Truth About Cars. It begins:
Imagine a different GM from today’s confused and embattled automaker. A General Motors where each division has a clear and coherent brand, universally known and recognized by automotive consumers. Where each division’s image and related price range is unique, without overlap. Where each division is the dominant brand– or at least highly competitive– in its respective market segment. Welcome to General Motors circa 1930.
In 1930 a Cadillac sold for 12 times the price of a Chevrolet. By the 1960s it wasn’t even twice the price.