PHILADELPHIA (CBS) – When it comes to St. Patrick’s Day, green always come to mind.

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Now we know just how much green Americans will spend today, and it’s a big number.

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The National Retail Federation predicts people in the U.S. will spend more than $5 billion in celebration.

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Over 139 million people are expected to mark St. Patrick’s Day in some way in the U.S., spending on average $38 per person.