The exclusion of the material as an axis defining postcolonialism risks postcoloniality being an aesthetic. Postcolonialism must engage questions of power; questions of power and colonial relations are never far removed from considerations of the material. In the context of studying drama and theatre, postcolonial studies need to engage with the material conditions of production and their implications.
http://www.lib.unb.ca/Texts/TRIC/bin/get.cgi?directory=vol21_1/&filename=review.wilson.htm