Bread size

Is it just Japan that does this?  Commercial bread – predominantly white and cake like – is sold in what I would call half loaf sizes.  Each loaf is the same size but you buy either 8,6, 5 or 4 slice versions.  The maths isn’t remarkable but you can imagine that a loaf cut into 8 slices yields slices half as thick as a loaf cut into 4.  Also in the picture you can see the top slice is off a non-standard big loaf from a wholesaler cut into micro thin slices, which are next to useless.