Tip'Em

I was researching about tipping trends and cultures worldwide for a small feature article. The insignificant looking thrifty money that we leave behind as a tip in restaurants surmounts to a multi-million dollar transaction in US alone. The waiter I interviewed at a Thai restaurant on Castro street, Mountain View, apparently makes more money than me and any of my friends. How's that? I inquired, but they have no new vacancies coming up anytime soon :)
Here's a study at Cornell about gratuities that I found both, useful and interesting - Beyond Gratitude and Gratuity.