I got the answer
1. When we see a rich guy passing by we feel "i wish i would have been like him". But when we see a poor guy, we feel we got the answer to my question ie we feel we are in a good situation than him.
2. It is always said that comparison kills the human happiness. Its true. But comparing with people who are at a level lower than us, it gives us a reason of life within us.
3. Comparison with lower grade people is good at times when we have hard times. But that comparison will never help us to lead a good life.
4. If we want to achieve success in our career, we have to observe the people a grade above us to boost our attitude.
5. The best thing that can be said is, should not always compare with others which does not lead to a peaceful life.
6. Comparison can be done at needed times, which might improve our lifestyle.