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Mexican fast-food chain’s new boss, Brian Niccol, wows Wall Street on debut
US burrito chain names four new directors as it looks to stem sales decline
Co-chief is confident his burrito chain can recover from food safety concerns
US restaurant chain’s link to illness outbreaks sparks federal probe and roils share price
Reputation among consumers can fall quickly and hard
Kimberly-Clark is latest US company walloped by the strong dollar
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