There are several reasons they excel, but when I did a Harvard Business Case about them the main factors were the supply chain innovation due the ability to mov

There are several reasons they excel, but when I did a Harvard Business Case about them the main factors were the supply chain innovation due the ability to move quickly and keep less inventories + not having to hire expensive designers by copying = fast copying. http://hbswk.hbs.edu/archive/4652.html http://hbswk.hbs.edu/archive/4652.html