I have never been to a hairdresser. My mother goes to one. I'll ask her.

Taxis do usually get 'rounded up.' I sense that this relates to avoid handling change.

Nonetheless, two examples of additional historic tipping custom in the US. (IIRC taxis in Europe dispense exact change).

My main point was that these old customs are headed into history. That the 'tipping' concept is on its way out. And that the big exceptions (where tipping is a substantial sum) -- waiters and bartenders -- are the last vestiges of this custom.

Why? Because it is cumbersome to have a two-tiered labor law defined around gratuities, and the conception of what constitutes a standard are so widely variant. We've heard everything from 10% to 20% on these threads.

For those traveling from abroad, just to reiterate, 15% is the standard for food service, plus $1 per drink, at the table or at the bar. The above poster is correct that you should "round up" your taxi fare, as drivers do not carry change.