Additonally, most foreigners who would comment on HN or Reddit are earning significantly higher than the average Japanese or even Tokyoian.

The people you're probably thinking of are working in finance or Japanese mega venture/US tech companies. They make up a vanishingly small percent of foreigners working in Japan.

> finance

Most finance roles in Japan almost exclusively hire Japanese nationals

> Japanese mega venture/US tech companies

They don't tend to hire foreigners in most cases except for Chinese (Taiwanese and Mainland) and Koreans

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