Yikes, £45,000 is less than $70,000. You're telling me your US equivalent at the top level could make twice as much you, while living in a (most likely) cheaper place? That is wild, if I were you I'd be looking for a job in the US, I know of a great downtown condo in Houston, TX coming free around the August timeframe
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But your post illustrates the point even more, the levels of expectation of status could be higher/lower depending on the position between the two countries, which makes the OP's question even more valid. It could be just as easily that what we consider an average lifestyle over here, is considered garish and ostentatious over there, i.e. if in your case I went from my U.S. job where my peers made $150,000 to a position in the U.K. where my new peers made less than $70,000, however I was still making the same $150,000, and nobody said anything to me about that disparity? My goodness it would probably be a car crash of things that I would do, say, drive, live-in, and visit that would make my peers think I was the most obnoxious show pony in the history of the world. All the while I think I am living normally, and wondering why my co-workers are giving me dirty looks haha.