Your parents love you and you love them , your friends love you and you love them , you love her and she loves you and so on it continues. Perfect story but what if in each part one part fails , we all know the relationship fails . Nothing new it is an established fact that we all are aware of that in practicality nothing called as unconditional love exist. But still from the very beginning of our life we are taught about love as an emotion which is pure and a key ingredient in the recipe known as relationships.

                                                                        In a world where each individual thinks that his life is mired with myriad problems he always seeks to develop a bond in which there exist a perfect 1:1 ratio of give and take   yes! when I say 1:1 I mean it. Look around you or if you are honest with yourself ( quite a tough act) introspect it , you will find that the people you really admire or people who share strong bonds with you have always maintained this perfect balance . A harsh fact to admit , if you don't believe it try it just once , disturb the balance and you will be showered with taunts and puns e.g  " I did not expected  this from you". So if our loved ones or "connected ones" share a socio-economic relation why is love considered so pure?
If seen by the angle above mentioned it is just a mathematical equation which is a combination of ratio of  output to input or it is just a fraction. So why has this mathematical fraction been so disguised as an emotional feeling .
             For better understanding let us take 2 sons of same family X and Y . Suppose X is a school dropout  and now is a drug addict whereas Y turns out to be brilliant in academics and has a nice job. Now my question is does the family love them equally ? Ponder over it practically not emotionally.
                In the above case initially the input of the family for both kids is same but since one disappoints the family whereas the other one meets the expectations hence output in case of Y is far more than X. Hence love for Y is greater than for X. If reciprocity can prove the strength of one of the most purest form of relationships ( son and his parents) don't you think that each relationship works on the same principle . And if your answer is yes then relationships are nothing more than showing  reciprocity.