Product downsizing in the face of inflation in order to maintain retail price points has long been used by food companies, notably manufacturers of candy.
The Arraigument, Tryal, and Condemnation, of Capt. John Quelch, and Others of his Company, &c. For Sundry Piracies, Robberies, and Murder, Committed ... Majesty's Allie, on the Coast of Brasil, &c.