Op risk modelling evolves

In the past year alone there have been three high profile cases of ‘fat finger’ syndrome – that is, dealers entering into large erroneous trades. In May, 2001, a dealer at Lehman Brothers in London traded a £300 million lot instead of an intended £3 million. This precipitated a 120 point fall on the FTSE 100 index – temporarily removing about £40 billion from the value of the UK’s top companies.

Then in November, 2001, a large erroneous trade involving Dow Jones Euro Stoxx 50 futures contrac

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