What do you think about parchment?

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I am a undergraduate.In 2009, I will graduate.Many people say that it is necessary to go to the gradtute school.Until yesterday i belived that.But now I am not sure.In the future I want to open my own company,so I think it's heplful to learn something about economy and management.But some bussinessmen are also very successful without high parchment.Now I am puzzled.