  We show the infrared equivalence between a recently proposed model containing
a six dimensional scalar field with a four-dimensional localized Higgs type
potential and the four-dimensional Nambu-Jona-Lasinio (NJL) model. In the dual
NJL description, the fermions are localized at the origin of a large
two-dimensional compact space. Due to a classical running effect above the
compactification scale, the four-fermion coupling of the NJL model increases
from the cutoff scale down to the compactification scale, providing the large
Fermi coupling needed for the dynamical symmetry breaking. We also present a
string theory embedding of our field-theory construction. On more general
grounds, our results suggest that 4d models with dynamical symmetry breaking
can be given a higher dimensional description in terms of field theories with
nontrivial boundary conditions in the internal space.
