Skew

Equity volatility backlash

Taking a long equity volatility position is a favourite macro hedge for risk managers and traders across asset classes, but the trade doesn’t always work as expected. How has the volatility experienced in May and June affected macro hedging? Joel Clark…

Surviving skew

Skew skyrocketed in May, breaking through levels last reached in 2008 after the bankruptcy of Lehman Brothers, while volatility and correlation also spiked. The dislocations are rumoured to have caused losses for some exotic equity books. How did dealers…

Smile dynamics IV

Lorenzo Bergomi addresses the relationship between the smile that stochastic volatility models produce and the dynamics they generate for implied volatilities. He introduces a new quantity, the skew stickiness ratio (SSR), and shows how, at order one in…

Smiling hybrids

Vladimir Piterbarg develops a multi-currency model with foreign exchange skew suitable for valuation and risk management of forex-linked hybrids, in particular power-reverse dual-currency (PRDC) swaps. The emphasis of the article is on model calibration…

Beyond Black-Litterman: views on non-normal markets

In normally distributed markets, the Black-Litterman technique allows managers to construct portfolios that account for their views on a set of expected returns. Attilio Meucci extends the Black-Litterman framework to generic market distributions and…

Smile dynamics II

In an article published in Risk in September 2004, Lorenzo Bergomi highlighted how traditionalstochastic volatility and jump/Lévy models impose structural constraints on the relationshipbetween the forward skew, the spot/volatility correlation and the…

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