Potentially it's items that move very very low volume but provide significant value by being available? For example, 7/11 in Japan sells underwear and shirts, with a bit of a selection even. No one is buying these except in an emergency, but having it there is a lifesaver. I also wouldn't be surprised if the average 7/11 location moved less than 1 unit a month of some of the whiskies they have available.
However surely this is a small fraction of all the products they sell.
However surely this is a small fraction of all the products they sell.