Everyone likes things that are free,and businesses often give things for free to customers as a way of getting more people to pay attention to their products.
    Ariely,a scientist from MIT,did an experiment on what people would do when  things that were free. He  a group of students two kinds of chocolates:the good one for 15 cents each and the poor one for 1 cent each.The good chocolate was worth$1.00,so 15 cents was very cheap,  the poor quality chocolate was worth 5 cents,so  it for 1 cent wasn’t very cheap.
    Most people chose the high quality chocolate for 15 cents.That’s not a .But then Ariely lowered the  of both pieces of chocolate by 1 cent.If people were correctly,then they should  choose the good quality chocolate.But that what happened.Most people chose the free chocolate.This doesn’t make sense in our  way of understanding economic behavior(经济行为).
    What is happening here?Ariely that people want to get a good bargain,but they also want to reduce risk(风险).That is,they want to the chance of making a .If you pay 14 cents for a piece of chocolate, and then you don’t  like it when you eat it,you have lost 14 cents.But when something is free and you don’t like it,you haven’t lost anything.People would  not to take a risk over getting a better bargain.