Ow are social relations expressed in consumption practices? Use detailed ethnographic examples in your answer

The essay is for an anthropology unit so the content has to reflect this and it must have ethnographic examples and/or case studies, to give detail and evidence and arguments. This essay is worth 50& of my overall mark for the course. Its for a British university course. It needs to have mentions of anthropologists who have done research in the area of consumption practices and social relations.