This study examines how firms in the pharmaceutical industry responded
to the R&D tax credit which was enacted in 1981. The change in resear
ch intensity (research/sales) subsequent to the tax change was estimat
ed for the firms. An increase in research intensity was associated wit
h the adoption of the tax credit. The strong response by the firms to
the tax credit and the effort to maintain their relative position in r
esearch intensity indicate that research intensity is an important str
ategic dimension and driving force in the industry.