With this work we try to analyse the agglomeration process in the Portuguese
regions, using the New Economic Geography models. In these models the base idea
is that where has increasing returns to scale in the manufactured industry and
low transport costs, there is agglomeration. Of referring, as summary
conclusion, that with this work the existence of increasing returns to scale
and low transport cost, in the Portuguese regions, was proven and as such the
existence of agglomeration in Portugal