One of the most important things that parents teach their children is 
        the virtue of not being self-centered.  In fact, most people tend to 
        think of egoism negatively as they emphasize the importance of a 
        selfless life.  Yet, in some ways, egoism can be a positive thing.
        
        It is little doubt that egoists always calculate their own benefits 
        first before making any decisions.  But instead of being an acquired 
        habit or part of a depraved personality, being self-centered may have a 
        biological basis.   According to social exchange theory in sociobiology, 
        it is natural for human nature to think more highly of themselves than 
        of others.  When the capital of a particular behavior is bigger that its 
        reward, normally the behavior will not be adopted.  In other words, 
        people who are egoistic will be unlikely to commit suicide out of 
        frustrated love.  In the egoists』 point of view, life is much more 
        precious than a rash decision.
        
        Besides saving lives, egoism may be useful in other situations.  Because 
        the society we live in overemphasizes the importance of group 
        cooperation, our innate egoism has been depressed for a long time. We 
        are afraid of being called self-centered only because we have been 
        taught to be sociable since we were young.    But there is nothing wrong 
        with considering our own advantages.  For one thing, Egoism makes people 
        dare to fight for their own rights.  Without egoism, people will easily 
        make lots of concessions and sacrifices, just as the obedient housewives 
        have done at the expense of their own well-being.
        
        For a long time, people have been taught that egoism is a synonym for 
        possessiveness and selfishness.  But in my point of view, egoism is one 
        way in which we can treat ourselves better and fight for our own 
        advantages.  In this competitive world, being egoistic is just one way 
        to survive.