Sir, Economics Nobel laureate Joseph Stiglitz, in “A split euro is the solution for the single currency” (August 17), writes that no one has figured out a way to make productivity grow in Greece, Spain and Portugal faster than in Germany. Actually, gross domestic product in the first half of this year grew in Spain nearly twice as fast as in Germany (Eurostat news, August 12).

Prof Dietrich Stauffer

Cologne, Germany

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