Sir, Economists have not been signing “round-robin letter, as Ross Clarke writes (Thunderer, Aug 24), but circular letters. Round-robin letters have the signatures arranged in a circle to disguise the order of signing. They became popular in the 18th century as a form of petition, in which the complainants concealed who had signed first. This was especially useful to sailors because mutiny was punishable by death.
Leftwing groupthink may be misguided, but it is not a hanging offence.
Angela Polsen-Emy
Birmingham