The strongest link in the Macrometropolis is between
São Paulo and
Campinas (100 km northwards), with
Jundiaí region cramped half way. There is continuous (and dense) urban sprawl all over the regions. You can't notice while driving in the two highways (16 lanes overall) that connected this area.
That's how they behaved population wise (metro areas):
----------------------------- 2010 ------ 2000 --- Growth %
Code:
SÃO PAULO -------------- 19,683,975 -- 17,878,703 --- 10.10%
JUNDIAÍ ------------------- 633,273 ----- 529,990 --- 19.49%
CAMPINAS ---------------- 2,630,893 --- 2,209,558 --- 19.07%
Now, the growth on the links. Southern Campinas metro area (two municipalities, wealthier) and northwestern São Paulo metro area (four municipalities, poorer):
----------------------------- 2010 ------ 2000 --- Growth %
Code:
Northwest SP MA ----------- 436,719 ----- 363,842 --- 20.03%
South Camp MA ------------- 170,404 ----- 130,188 --- 30.89%