SINGAPORE (Sept 3): When I visited Cambodia for the first time in the early 2000s, I was intrigued by the way people there used two different currencies seamlessly, often in a single transaction. For instance, I would pay for goods at a market in US dollars, but receive any change of less than US$1 in Cambodian riel. And, while I made many small purchases in riel, I found that US dollars were just as acceptable everywhere.

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