What's the difference between third orld and first world?

Street life of Hanoi reminds me a lot of the Hong Kong from my childhood - the street vendors with delicious speciality sometimes appreciated only by the locals, neighborhs gathering randomly on the streets sitting on small plastic chairs chit-chatting with a fan in their hands, and neighbors run into each other on the street, stopped, and catching up with each others.  There was always time to talk to others and offer a helping hand to others.  Food stall owners knows you by name and know exactly what to serve you as soon as you sit down.  Doors was always open for my playmates of next doors at my grandma's.  I can go in and out of my neighbor's house and have meals with their family needing no prearrangements.  It is expected to take care each others it seems without anyone saying out loud.  The sense of community was very strong.

At Sapa, the lady at our homestay asked me, 'you don't know your neighbor 10 feet away from you? Not even one?'  She was astonished and unbelievable that we people from so call first world country doesn't know our neighbor, let alone having a relationship with them like the Sapa people do.  It is natural for people in Sapa to help each other.  During rice planting or harvesting seasons, the community first help the elderly at their land before they do their own.  All neighbor help each other to finish their land.  There seems to have you mind your own business.