One economist told Newsweek that companies may be wary of "consumer backlash" if they hike prices to mitigate the tariffs' impact.

That statement came some 12 hours after Trump announced an agreement Sunday with the European Union that would see a 15% tax paid on products brought into the United States from the bloc. The E.U. also agreed to spend $750 billion on energy purchases from the U.S., while investing an additional $600 billion here.

President Donald Trump said on Monday most trading partners that do not negotiate separate trade deals would soon face tariffs of 15% to 20% on their exports to the United States, well above the broad 10% tariff he imposed in April.