It might sound like a risky strategy at a time when millions of Americans are drowning in debt: keep raising the limit on people’s credit cards, even if they don’t ask.

But that’s exactly what big banks have been doing lately to turbocharge their profits, leaving customers with the potential to rack up even bigger monthly bills.

For years after the financial crisis, Capital One Financial Corp. resisted that step for customers who looked vulnerable to getting in over their heads. In internal conversations, Chief Executive Officer Richard Fairbank characterized the restraint as a radical theology, in part because it went beyond post-crisis requirements, according to a person with direct knowledge of the discussions.


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