That is covered in the article. Alice should take on that cost to reduce the cost to John, demonstrating that she takes seriously the commitment she has broken rather than just scrapping it the moment it did not suit her.
IMO people should pay each other money for various acts that provide value much more often than the do.
Within a social circle, non-denominated performance of favours is the usual method, the magnitudes involved decreasing with distance, although never quite to zero. That way of doing things is the social fabric.
I do not ask money for giving a stranger in the street directions to where he wants to go.
That is covered in the article. Alice should take on that cost to reduce the cost to John, demonstrating that she takes seriously the commitment she has broken rather than just scrapping it the moment it did not suit her.
Within a social circle, non-denominated performance of favours is the usual method, the magnitudes involved decreasing with distance, although never quite to zero. That way of doing things is the social fabric.
I do not ask money for giving a stranger in the street directions to where he wants to go.