Are you a rational consumer?

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Do you have the experiences that when you go into a store, something just catch your eyes,because it is a bargain, have attractive appearance, or any other reasons. At that moment, you think you must purchase it, despite the fact that you don't need it right now, or will never get a chance to use it. If this often occurs to you, have you ever think about it? How are you going to do to prevent such circumstance?