What if every cash register had a button, which when pressed at the discretion of the human behind the desk when they see a family struggling or a child that is being bullied or an immigrant trying to find their way, quietly deducted 20% to be reimbursed from the war fighting part of a nations military budget (topped up by a levy on the super rich).

The receipt could then be used to borrow a single library book and have a URL for a site where there was neutral non judgemental help available.