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I think, partially, Wodehouse isn't that well known by Americans. Pre-internet/ebook era, I struggled to find his books in libraries or bookstores.

Thanks for this and this is interesting to learn! I didn't expect that level of consistency across the definitions (and I suspect my priors are heavily conditioned by urbanicity).

Not a economist but most class definitions in other analyses seem based on percentiles of income as opposed to multiples of the poverty line or a notion of the lifestyle of each income class (e.g. middle class = affording basic house+groceries+healthcare+car+.. )

Agreed. Their statistics seem fine conditioned on their class definitions but their thresholds seem very low and don't align with the lived experience I observe: "$200,000 to qualify as upper-middle class, whereas by our definition, it needs less than $135,000."

As a counter -- it has been useful when dealing with insulin resistance (even when not diabetic) to
* identify which foods (and how much) are more likely to spike glucose
* identify how much post-meal exercise needed to bring the spikes down