Trust

Trust is a valuable commodity but then it isn't something that can purchased for any price.  You cannot measure it out as needed.  It can't be summoned at one's will.  You know deep inside when it is present and your mind shouts when it isn't.  A person can build trust but they cannot manufacture it.  You can't transfer it from one relationship to another.  It has to be.  It is or it isn't.  You decide.