Is 'out of control' US tipping culture spreading overseas?

In many US cities tips of 20% are now expected at restaurants The debate about tipping culture in the US has reignited in recent years, with social media posts about waiting staff angry that they haven't been left enough money going viral. Is this increased pressure to tip, and to do so generously, now spreading around the world? Lillian Price thinks that tipping in the US is "out of control". "It's too much," she says. "You might just be grabbing something to go, and you are expected to tip," says the animal care worker who lives in Philadelphia. Price, who...