Sue Kirk runs the shop on Eigg - a small island in the inner hebrides.
Sue can stock what most people on the island want with a reasonable amount of certainty - so long as their tastes don't change too quickly - but what she doesn't know is how much they'll buy.
People often leave the island, for work, to visit family or to do all the usual things that in a larger community don't have an affect on the shops they use. But with such a small number of people, the affordance for change is small - or as Sue told me "you don't have to lose very much before you're losing" so Sue orders small daily deliveries of a wide number of goods, changing the amount and range whenever she notices a change in buying behaviour.
A system never exists in isolation, and with an unbalanced friction in and out of that network, someone has to absorb change, in this case, literally.