According to Philip R.Shaver, there are three "behavioral systems" that play a role in romantic love: attachment, caregiving and sexual attraction.
You view love as an attachment when you are emotionally dependent on the other person for your happiness, safety and security, while love as caregiving refers to the great pleasure you receive from supporting, caring for and taking of a loved one.
Lastly, love as a sexual attraction is when you can't get the other person out of your mind and the thought of him or her excites you and turns you on.
If we will based the statement above from Shaver's model, we can say that the love being felt by John and Cynthia for each other transcends from attachment love to caregiving love.
These limitations are based on the fact that a hypothesis must be testable and falsifiable and that experiments and observations be repeatable. This places certain topics beyond the reach of the scientific method. Science cannot prove or refute the existence of God or any other supernatural entity.
The answer to this question is equity
theory. The equity theory is a theory that was developed by the
behavioral psychologist John Stacey Adams. An equity theory of motivation
focuses on the idea that the people / employees are being motivated because of
the fairness that was being set to them by the company and if the employees
receive an unfair treatment they are being demoralized and un-motivated to do
well in their jobs / tasks.
Following rules of behavior to help maintain order is part of social control - b.
Having social control in any society helps it be maintained and properly functioning which in contrast to not having such social rules of behavior where the workflow of such a society wouldn't go as planned.