Derivatives that track bonds at the heart of Credit Suisse rescue slide

Derivatives that track the value of key bank debt fell sharply on Monday, after UBS (UBSG.S) agreed to rescue rival Credit Suisse (CSGN.S), forcing a massive writedown of the latter's additional tier-one debt as part of the deal. Invesco's AT1 Capital Bond exchange-traded fund (INAT1.L), which…

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