WordNet (r) 3.0 (2006):

consumerism
    n 1: the theory that an increasing consumption of goods is
         economically beneficial
    2: a movement advocating greater protection of the interests of
       consumers

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "consumerism":
   buy, buying, buying power, buying up, catalog buying, coemption,
   consumer power, consumer sovereignty, cornering, emption,
   hire purchase, impulse buying, installment buying,
   mail-order buying, marketing, money illusion, purchase, purchasing,
   purchasing power, rebuying, repurchase, shopping, shopping spree,
   window-shopping