KitKat is very fragmented already! ;) [1]
[1] http://www.buzzfeed.com/lydiah/35-kit-kat-varieties-from-aro...
[1] http://www.buzzfeed.com/lydiah/35-kit-kat-varieties-from-aro...
Somehow they can afford having a convenience store (combini) open 24h each 350 yards and at each side of the street. Economy at an amazing scale.