It's time for our latest feature, That's So Dow 14,000, where we fondly remember those heady days when New York City was seemingly paved with gold. Today's subject: Choosing Your Gratuity.

Back in the good old days of Dow 14,000, New York City diners could choose their own gratuity to leave servers after a meal. While it was once acceptable to leave 15%, the last decade saw that rate rise to approximately 20%, and sometimes a bit more. Those days appear to be over, as Chinatown landmark Joe's Shanghai has instituded a mandatory tipping policy, making sure that all of their hard working dumpling slangers get at least a 15% tip from their customers. According to the sign, this is done "For Your Convenience", minimizing the chance that you think too long about cutting that gratuity down to 10%.