PROD
CTIVITY
THEORIES
1976: 19) goes on to state explicitly that (
ust as there are syntactic rules for the
reation of sentences
there must be rules for the creation of new words
rules which
e terms ‘Word Formation Rules’ or ‘WFRs’. We might want to argue with the
etails of what Aronoff sa
s in the passa
e cited, but it does not make an
crucial
ifference from the morpholo
ical point of view. Somethin
like
oo man
cooks
poil the broth could be seen as an actual sentence of our lan
ua
e
ust as kin
dom
s an actual word
both can be attested
n corpora and the like), and something like
ow do you do
might be an impossible but actual sentence, just as
ength i
an
m
ossible but actual word
neither could be created in the
nt
tat
f th
anguage system, but both can be attested).
t is worth pointing out here that the focus on possible words in morphological
tudy, though not original to Aronoff, is one which has often been ignored in the
ubsequent literature. Much of level-orderin
theor
, for instance, is concerned with
actual words, and frequentl
with impossible actual words (a class which is called
‘lexicalized’ b
other scholars, e.
. Bauer 1983: 42-61).
Returning to Aronoff’s view of productivity, we find he views productivity as a
elationshi
between
ossible words and actual words
Aronoff 1976: 36
. The
mportant point that he makes about this is that no affix can be said to be absolutely
ore productive than any other affix (or morphological process); productivity has to
be tied to particular base types. This approach is later discussed in terms of limiting
productivit
to specific ‘domains’ (Van Marle 1985). Aronoff here, in common with
ther lin
uists of the period, considers the affix as choosin
the bases to which it
a
be added. In more recent lin
uistic theories (see e.
. Gie
erich 1999) this is
ften turned round, and linguists have started speaking in terms of bases selecting
he affixes which can occur on them. Williams
1981: 250
uses the ter
‘potentiation’ in this sense: if a base undergoes some morphological process, it gains
he potential subsequently to undergo some other specific process. Alternatively, we
fin
i
i
n
f
put constraints (e.g. Plag 1999)
according to which it is the
well-formedness of the final word which is the crucial factor in determining which
processes ma
appl
to the output of other processes. All of these approaches are
wa
s of attemptin
to determine what is or is not a permissible sequence of
orpholo
ical processes, and this is seen as part of what determines the productivit
f certain
rocesses.
hile Aronoff’s view of productivity as the rate at which a particula
orphological process is exploited with a particular base-type seems reasonable as
an idealized definition, in practical terms it is not possible to use it to provide the
ndex of productivity which Aronoff fore
es unless we make a large number of
extra assumptions. For example, although the notion of an ‘actual word’ appears not
nl
unob
ectionable but even theoreticall
necessar
, we have no accurate wa
of
decidin
at what point a possible word becomes an actual word. Countin
somethin
uch as whether the relevant word appears in a particular dictionary is only a
ubstitute measure for a word having beco
e actual. As Aronoff
1976: 37
himself
points out, though, the outputs of the most productive morphological processes tend
t t
li
t
–
ith
r in
r m
ntal
i
ionaries, or in paper dictionaries. Thus any
dictionary-based measure is likely to underestimate the productivity of a
ynchronically extremely productive process, while giving a much better measure of