Citi's CFO says a credit card cap would have a 'deleterious' impact on the economy

Citi reported fourth-quarter earnings on Thursday.

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• Citi's CFO Mark Mason said Trump's proposed credit card cap would have a 'deleterious' impact on the economy.
• Mason said Citi could not support a cap, though he emphasized the importance of affordability.
• The bank reported fourth-quarter earnings on Wednesday.

Citigroup Chief Financial Officer Mark Mason warned that President Donald Trump's proposed 10% cap on credit card interest rates could have dire consequences.