It would be interesting, in academic geeky sort of way, to know where has your money travelled after you paid for that tea. TrackGandhi tries do this, though currently with their popularity and internet usage in India being what they are, outcome may be a decade away.
Bookcrossing does the same for books in US (and other 130 countries, so it claims). Find a book, register, read, drop it somewhere else to find. I found once in Los Angeles at Bus Stop.
Follow your rupee-notes on their travel throughout India and beyond. Check where your money has been before and where it moves to. Find out what the notes have or will been used for.
Bookcrossing does the same for books in US (and other 130 countries, so it claims). Find a book, register, read, drop it somewhere else to find. I found once in Los Angeles at Bus Stop.