A top economist thinks Trump's big affordability push will do more harm than good

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• Trump has zeroed in on key affordability issues facing Americans.
• He's pitched plans to lower mortgage rates and cap credit card interest.
• Economist Mark Zandi thinks the proposals will ultimately have the opposite intended effect.

President Donald Trump has floated some big ideas to make life more affordable for everyday Americans in the last week, but one veteran economist has his doubts that they'll make much of a difference.

In fact...