57k€/year is a professional's salary in Italy.

Average is 32k€

With 57k€ you can afford to live comfortably, even get yourself a roomy flat, which is unusual for single individuals.

*Exceptions may apply, see Milan or other big cities

57k usd is a little less than 42k gbp

55k dollars in the US gets you a crappy apartment and a 7 year car loan.

Well then I guess they don't mean UK do they?

Postdocs are definitely not getting 55k in the UK except maybe if something like medicine is special? The range is like 36-45ish.

That is not a decent salary, that is so low. I made almost that much just out of college in the U.S. Once I made it just over 10 years as EE, I was double that.