单项选择题

Questions 26-30 are based on the following passage:
  in a global survey released in 2012,half the responders admitted to buying things they really did not need.Two thirds are worried that consumers are buying too much.Such concerns may be justified.Many consumers have become trapped in debt.Researchers say that instead of making us more satisfied,high levels of consumption may lead to grcater stress and unhappiness!
  As consumers,we are subjected to a great amount of marketing.What is the goal of marketers?To turn wants into needs.Marketers know that consumer behavior is driven largely by emotion.So advertisements and the shopping experience itself are designed for maximum emotional appral.
  When you ask a consumer:Why do you buy so much?He or she may answer:I want to improve my quality of life.It is naitural that people want a better life.Advertisers bombard us with messages that all of out desires--better health,security,relief from stress,and closer relationships--can be acheived by making the right purchases.
  But actually,as our number of possessions increases,our quality of life can actually decrease.Additional time and money are needed to care for more material things.Stress levels rise because of pressure from debt,and there is less time for family and friends.So you should protect yourself from becoming a victim of clever markers.You should put emotion aside,and compare marketing promises with reality.
 

Many consumers are buyinh too much,because（）。

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