My Grandson,

For a relationship to be successful, there must be A DOUBLE COINCIDENCE OF WANTS

The man has exactly what the lady is looking for and the lady also has exactly what the man is looking for. Both are willing to exchange what they individually have for what the other person has; same amount, same quality, same period. That is the foundation of a barter trade. In this case we say there are no excess demands or excess supplies. The relationship is in equilibrium

Your Granny,

Adwoa Mercy