Good info, thanks.
Yeah, I admit it is complicated, and costs vary widely by country and item purchased. Food (including dining out) seems to be something that is consistently much cheaper in the US. Same for gasoline, but most of that is obviously due to taxes.
And there are some local oddities. Stockholm is like your description of Dublin. Rents and real estate look like a bargain to me - what you might expect in a small midwestern US city. But everything else is through the roof. Nominal rents in London seem moderately above places like NYC, but then you have to add the council taxes, which could easily add 20% to the price.
So maybe it's not 2x, I don't know. But I do know that these other places seem extremely expensive to me, and when my European friends come here, they are amazed at how cheap it is. That's why I think the dollar is undervalued.
Okay, enough of that... Happy Thanksgiving!