There was a time when we were living in Delhi and we used to drive down to Jaipur, where our extended family was. We kids looked forward to the drive, as it meant nice stopovers, snacks, etc.
After leaving Delhi we would , after an hour or so, make our first stopover in a little village called .... Gurgaon! There we would have chai, samosas, etc. In those days Gurgaon was separated from Delhi and a sleepy little village.
When the capital expanded, those villagers became instant millionaires.
A lot of comments in this thread are crediting TCS, Infosys, etc for lifting people out of poverty, but another factor was the skyrocketing realestate prices. Small-time farmers who could barely make ends meet suddenly were sitting on million-dollar land holdings.