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that's fair -- and unknowable, of course. There's also a novelty vs long-term consideration thing there... like, instantly most would swap just because of some aspect that catch their attention, right, but unclear they'd wanna stay there after a year or 5. But yea, generally good question to ask.

As for translating earnings, if you really must then find a local nominal anchor -- the price of [whatever] was X, an average daylabor made Y.

Or, as I suggested in a blog post long ago, make the equivalent of academic confidence intervals:

so, writing about Mr. Darcy's 10,000 a year, maybe say:

The girls marvelled at Mr. Darcy having 10,000 a year [earnings-translation: £487,000-£591,300-£2,767,000], what an astonishing gentleman!

Ugly and would never happen, but it's better than the implicit nominal bias ("oh, 10,000 pound isn't that bad, that's what I make in x weeks")