The document discusses productivity in word formation processes. It provides examples of how affixes can be added to source words to derive new words, such as "actor" to "actress" and "happy" to "happily". It defines a completely productive process as one that can derive an existing word from every appropriate source word. It then examines the productivity of different affixes like "-ly", "-ess", "-ine", and "-er". The document also discusses how semantic relations between predicates can be described, using examples like "unpleasant" as the negative of "pleasant".