Lexical statistics and a production experiment are used to gauge the e
xtent to which the linguistic notion of morphological productivity is
relevant for psycholinguistic theories of speech production in languag
es such as Dutch and English. Lexical statistics of productivity show
that despite the relatively poor morphology of Dutch, new words are cr
eated often enough for the marginalisation of word formation in theori
es of speech production to be theoretically unattractive. This conclus
ion is supported by the results of a production experiment in which su
bjects freely created hundreds of productive, but only a handful of un
productive, neologisms. A tentative solution is proposed as to why the
opposite pattern has been observed in the speech of jargonaphasics.