Listen up, JPMorgan Chase (JPM) CEO Jamie Dimon. 

The Federal Reserve's looming unwinding of its $4.5 trillion balance sheet won't disrupt markets as long as the Fed sticks to its script, according to Moody's Analytics chief economist Mark Zandi.

Dimon made comments earlier this month sounding the alarm on the balance sheet. 

Zandi said the markets didn't react when the Fed previously issued guidance about its balance sheet unwinding process. 

"If the Fed accelerates that normalization of the balance sheet, then you'll have some market reaction," Zandi said.

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