During a summer of visiting family in the US and Italy, one cultural difference has stood out, creating some awkward moments: when, where and how much to tip.

It’s a shock from the moment you get that cab from JFK Airport into Manhattan. On top of the $70 set fare and endless tolls and taxes there is that sinking feeling when the digital screen flashes three tipping buttons: 20%, 25% or 30%!

I’ve spent enough time bouncing between New York, London, and Rome all my life to know that tipping is a toxic subject. No matter what you pay, someone will tell you you’re doing it wrong.

In the US, dining out or staying in a hotel means living inside a tipping paradox. Officially, the........

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