Biographical note: RebonatoRiccardo: Riccardo Rebonato is Head of Group Market Risk and Head of the Quantitative Research Centre (QUARC) for the Royal Bank of Scotland Group. He is also a Visiting Lecturer at Oxford University's Mathematical Institute, where he teaches for the MSC/Diploma in...

Taking a portfolio perspective on option pricing and hedging, we show that within the standard Black-Scholes-Merton framework large portfolios of options can be hedged without risk in discrete time. The nature of the hedge portfolio in the limit of large portfolio size is substantially different...