Reciprocity is an integral part of building relationships. Without it, there will BE no relationship, which is why it is the foundation of all relationships...
Reciprocity can be seen everywhere---even with horses. When one scratches another on the back or flank, the "receiving" horse returns the favour and scratches simultaneously. (So as I scratch Cass' belly here, he scratches my leg. How different would our professional and personal lives be if we all looked for ways to reciprocate when someone reaches out with positivity and kindness?
It's that simple.