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Rather than emphasize how particular kinds of objects are either gifts or commodities to be traded in " restricted " spheres of exchange , Arjun Appadurai and others began to look at how objects flowed between these spheres of exchange ( i.e. how objects can be converted into gifts and then back into commodities ) .
 Arjun Appadurai
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Arjun Appadurai