I'd say agressive. They have exactly followed Darwin's 'survival of the fittest' theory and know how to thrive on limitted sources by fighting it out.
Is it a good thing? I'm not sure but I, for one, wouldn't vouch for it.
Fight to get into a local, once in, fight to get a seat, preferably a window seat. And, if you're one of those unfortunate who don't have the privelege of getting into a starting local you fight for that coveted 'fourth seat'. I've never been able to understand why women plead, prod and more often demand from sleepy, tired commuters to squeeze in so there is a little space for a fourth 'candidate'. Actually, there's barely any space to place your bums (sorry for the laguage) there and its as good as squatting in space. That you cause discomfort to those who were already sitting there is another story.
Get off the train and you'll see people shoving and pushing each other to get ahead out of the platform.
Go to buy vegetables and fifty fingers will hit on one 'tokri' of ladies' finger and there will be a rattle-tattle to bargain.
Go to buy a train coupon or to renew your first class pass, those standing in the queue will start yelling, hooting, complaining and making faces just because you don't have to stand in a queue - that's the only privelege, which first class commuters get, in fact.
Does this place have any hope??!!
I'v stayed in Mumbai all my life, barring the first seven years and honestly, not once, not for a single day or a single moment have I fallen in love with this place. They call it the city of dreams, the financial capital of India, Bollywood's haven and what not but I'd say 'the grass on the other side is always greener'.
There is no hope left in Mumbai anymore... its been over-exploited. It has a weak infrastruture, which cannot support the influx of new immigrants. It has a poor transport system, though its better than all the other cities in India but that is not truly the right benchmark.
There is water shortage, long hours of loadshedding (though the main Mumbai city is saved), flooding during monsoons, bad sticky weather and the most important terrorism threat. Why do people still want to come here? For money, period. I

