Seth Godin, brilliant as always, distinguishes buying from shopping. The latter has more to do with desire, fantasy and pleasure; whilst buying is simply the act of getting of what one needs.
This distinction between desire and needs has been the debate in philosophy for ages. From those who condemned desire as a dangerous futility leading to alienation to those who praised desire as a pure human energy, desire has been the drive of consumerism as an ideology.
For mass consumerism requires mass production and the latter gave birth to injustice, human slavery, economical clash, more class divisions, global warming and the list goes on.
As usual, Seth Godin puts it in simple words and deep thinking. Read its post down below for more food to the mind.