We pay $100 per month for daycare which is open 6:30 to 18:30 if we need it for that long.
School costs us nothing out of pocket.
Our grand total out of pocket medical costs for our kid thus far (turns 4 in March) is around $500. Including any medication we've ever bought for him. Half of that $500 went to spending Monday through Friday at the hospital when he was born, in a hotel style room with three meals a day included for the both of us.
We didn't need private health insurance for that, nor have it provided by either employer.
We also received 480 paid parental leave days to be split between us (90 reserved for her, 90 for me, the remaining 300 at our discretion).
That's some evidence right there. I have no numbers from the countries you mentioned though. The difference there could be smaller.
$80k in London as a single 20-something is great and you might be able to save a little while living central, while for a family of 4 it'd be much tighter and you'd live further out of the city.
$80k in Manchester and you'll have a comfortable life as a family of 4.
$80k in Poland and you'll be laughing in a luxury flat somewhere with no financial worries.
Europe is a large place and for the majority of countries and cities that is enough money to live extremely comfortably.
As for evidence, the average median salary in Europe is 16943€ or $18,947. The average salary in the US is three times this amount so sure - it goes 'a lot further in Europe'.
> $80K goes a lot further in Europe than it does in the US.
I would like to see evidence supporting this assertion. Luxury meats are about the only thing I can think of that are more expensive stateside.