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Hundreds of millions in the US is from $0.30 up to $2.99 per capita.

Maybe similar in scale to yearly losses from stuck vending machines.

"The researchers estimated that the average loss per worker over the course of a year was $2,634, out of total earnings of $17,616." -- TFA

Per worker who lost wages, not per worker across all workers.

Every vending machine should have a "just give it to me" button. I don't care about you not having change - i want the product...just give it to me.