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In arguing grade "inflation" at A level, Bruce Charlton (Letters, 13 August) uses a monetary term that refers to the amount of money in existence and its velocity of circulation. But A levels are about knowledge. This has certainly increased in quantity, and one result is that present A-level syllabuses include a lot of knowledge that was covered in first degree papers 30 years ago. Moreover, the equivalent of monetary transactions (here, knowledge transactions) have also increased: more A-level candidates, more A-level teachers, more effective teaching, more motivation and more time spent on study. Is this to be regretted?

Ken Regelous, Kilgetty, Pembrokeshire.