The Chinese invented paper money :) so it's not as though the concept is foreign to any of them. While there might be some differences between cultures in that regard, I think it's kind of a stretch to try to explain away the not very nice data points. I think the data can probably be interpreted in a straight forward manner: if you lose something in China, you're not going to get it back and that's that. It is what it is.

"There's a reason the authors stopped short of making any social commentary in their study." I think because it would be way out of bounds. Casual commenters such as us have a little space to speculate (unless dang gets fussy), but it'd be too improper for researchers to make assumptions.

One major thing missing in this study is the rural/urban divide. I suggest London is not representative in any way of the rest of the UK, and neither is Manchester the same as Penzance.

Edit: I should note that the authors do indeed go into trying to find cultural correlates, they go right for '% protestant' etc. and make some fairly speculative comments which I would be uncomfortable with because these are all just correlations. Notably, one of the highest 'correlations' is 'latitude' (!), it's not as though being at a certain latitude makes one more civic. Maybe there are other, related, factors, but it's certainly not latitude.