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Regional Growth and Local Convergence: Evidence for Portugal
Convergence among regions, according to the author, might be responsible for a propensity to national growth. In the same way, if there is a sub regional division (with different economic realities the same phenomenon should be verified. Thus, sub-regional convergence should lead to regional growth. This regional desegregation of space (in political terms) varies from country to country.
Link
http://www.ersa.org/ersaconfs/ersa03/cdrom/papers/323.pdf