Attenti a quel rischio
Il Comitato di Basilea ha pubblicato in luglio una revisione delle proposte per l'applicazione di un requisito patrimoniale al rischio incrementale di default nel trading book. Le nuove regole estendono il trattamento a una più ampia gamma di rischi oltre a quello di default - in particolare, il rischio di migrazione del rating, di ampliamento degli spread e di movimento dei prezzi azionari. La proposta, tuttavia, non manca di suscitare timori per il suo possibile impatto negativo su alcuni settori di business. John Ferry
L'assetto di Basilea 2 presenta qualche falla, e la crisi creditizia ne ha imposto il riconoscimento. I risk manager hanno sicuramente sottostimato i rischi di default, di correlazione e di liquidità, ma anche la misura del VAR usata per il calcolo dei requisiti patrimoniali a fronte del portafoglio di negoziazione (o trading book) ha dimostrato di non saper cogliere tutti i rischi associati ai prodotti cartolarizzati complessi.
Con l'esplosione della recente fase di turbolenza finanziaria, le
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