A super-interesting book on all this is Jonny Steinberg "A Man of Good Hope". Or at least partly on this, the man in question is a Somali who goes many places,

A super-interesting book on all this is Jonny Steinberg "A Man of Good Hope". Or at least partly on this, the man in question is a Somali who goes many places, but one of his jobs is to work in such stores. And his inside perspective is very different to TFA's fairly academic interview-some-people one.