The relative value of currency isn’t actually that good a metric of its worth. It tends to correlate because of you have a ton of inflation, as you often see in failing economies, then your exchange rate gets really high. But the Yen, from what I recall, is pretty close to being the US cent. So a $3 thing might be 300 Yen, but a $10/hour wage would be 1,000 Yen, say. So it all works out about the same.
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