Brave New World criticizes the industrial economic systems of the era in which it was written by imagining those systems pushed to their logical extremes. The industrial revolution that began in the second half of the 19th century and sped up through the 20th allowed for the production of massive quantities of new goods. But there's no value in producing new goods that no one wants, so the willingness of the masses to consume these new goods was crucial to economic growth and prosperity. It became an economic imperative, then, that people always want new things, because if people were satisfied with what they had they wouldn't consume enough to keep the wheels of industrial society churning along. Some people would argue that almost all of advertising is an effort to make you, the consumer, consume things you don't really need.
The World State in Brave New World has made consumption one of its centerpieces. All World State citizens are conditioned to consume. Hypnopeadic teachings condition them to throw out worn clothes instead of mending them, to prefer complicated sports with lots of mechanical parts to simple games, and to refrain from any activity like thinking or reading that doesn't involve the payment of money for goods. It is as if the citizens of the World State exist to serve their economy, rather than the other way around.