Albert G. Z. Hu and
Adam B. Jaffe
"Patent Citations and International Knowledge Flow: The Cases of Korea and Taiwan"
JEL codes: O14, O19, O31
This paper examines patterns of
knowledge diffusion from the U.S.
and Japan to Korea
using patent citations as an indicator of knowledge flow. We estimate a
knowledge diffusion model using a data set of all patents granted in the U.S.
to inventors residing in these four countries. Explicitly modeling the roles of
technology proximity and knowledge decay and diffusion over time, we find that
it is much more likely for Korean patents to cite Japanese patents than U.S.
patents, whereas Taiwanese inventors tend to learn evenly from both. We also find that both Korea
and Taiwan are
surprisingly reliant on relatively recent technology.
Pre-publication pdf copy.