Five potatoes

The university canteen, which serves food unchanged since I was at university thirty years ago is clearly in the grips of the portion-controllers.
When they offer roast potatoes, a severe sign used to limit people to six potatoes (or parts of a potato, to be strict). Today the ration has been cut to five, though the pieces of potato are no bigger.
Revolutions have started over less. When the students return, there'll be trouble.
While I'm on the subject, who in the University Bookshop thought to shelve Herodotus in fiction?