Do  we  need  stress?

My research paper focuses on the arguments on the necessity of stress. I choose this topic because it has long been a topic of hot debate, and for me, a student without a very good psychology when facing stress, it is really meaningful for me to know more about this issue. I colleted all the information through three ways: first, I search related websites on line. Then, I look through many books which talks about this issue. And while writing, I also associate my own experience and what I have known already. At last, I draw a conclusion that, though stress has a causal relationship between health problems and the commercial cost, we still need a certain amount of stress, because it will bring out the best in us. And by managing stress positively, one can achieve health, happiness, prosperity and longevity, all aspects of success.