Another example would be cadbury (chocolate company) and another shade of purple. It makes sense - if you go into the shops and see a wall of purple, it is nice

Another example would be cadbury (chocolate company) and another shade of purple. It makes sense - if you go into the shops and see a wall of purple, it is nice if you know what this actually represents, and don't have all the different brands converging on the colour of the most popular brand.