One way to prevent counterfeiting is to gradually replace the circulating $50, $100 and $1,000 paper notes with plastic ones, as they are more difficult to counterfeit ("Man nabbed for producing fake notes"; June 1).

Countries such as Brunei and Australia have already gone totally plastic with their currency notes.

Given that we already have $2, $5 and $10 plastic notes, perhaps the Monetary Authority of Singapore could consider going totally plastic for other denominations as well.

Lee Yong Se