Plato's Laws on Money

https://books.google.com/books?id=0GRFAAAAYAAJ&pg=PA280&lpg=PA280&dq=plato+there+must+be+a+coin+having+a+value+among+the+members+of+a+state+but+no+value+to+the+rest+of+the+world&source=bl&ots=uWKhLPadDc&sig=ixl-_OkupOccfDHsjiPxPqtFSno&hl=en&sa=X&ved=0ahUKEwiJidbE47bKAhXKuIMKHeNfDJAQ6AEIIDAB#v=onepage&q=plato%20there%20must%20be%20a%20coin%20having%20a%20value%20among%20the%20members%20of%20a%20state%20but%20no%20value%20to%20the%20rest%20of%20the%20world&f=false