Sir, The recent rise in popularity of cryptocurrencies, as discussed in excellent articles by Izabella Kaminska and Richard Waters (Market Insight, May 26; Inside Business, May 26), is surely a natural further consequence of global quantitative easing.

If central bankers can seemingly print currency “tokens” with impunity in order to finance whole economies, it seems churlish to frown on anyone else who tries to do the same on a smaller scale.

Mark Boulton

Winkfield, Berks, UK

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