The traditional empirical approaches to the analysis of economic growth, cr
oss-section and panel data regressions are substantially uninformative with
respect to the issue of convergence. Whether national or regional economie
s appear to converge in terms of per capita income or productivity levels (
the so-called beta -convergence) critically depends on the way in which the
empirical model is specified. Traditional specifications witness a disprop
oaionate presence of proxies for forces leading towards divergence among th
e conditioning variables. It is therefore hardly surprising that these anal
yses find a positive and statistically significant value for the estimate o
f the speed of convergence.
A more constructive use of cross-section and panel data regressions is in t
he analysis of the determinants of growth. The present paper therefore buil
ds on recent work on the role of different growth determinants (Cheshire an
d Carbonaro 1996) and analyses the growth performance of 122 Functional Urb
an Regions (FURs) over the period 1978-1994. This model explicitly recogniz
es growth as a multivariate process. In this new formulation it incorporate
s a spatialized adaptation of Romer's endogenous growth model (Romer 1990),
developing the work of Magrini (Magrini 1997). Magrini's model originated
from the view that technological knowledge has a very important tacit compo
nent that has been neglected in formal theories of endogenous growth. This
tacit component, being the non-written personal heritage of individuals or
groups, is naturally concentrated in space. As a result, technological chan
ge is profoundly influenced by the interaction between firms and their loca
l environments.
The present paper reports the results of the estimation of a fully specifie
d model of regional growth in per capita income. Particular attention is pl
ayed to the role of research and development (R&D) activities, and to the i
nfluence of factors such as Universities that shape the local environments
and have important policy implications.