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That's because the companies importing the goods may pass the costs of the tariffs on to customers or simply bring fewer products into the country, creating a limited supply.

That's because the tax is paid by the domestic company importing the goods, which may choose to pass the cost on to customers, or to reduce imports, meaning fewer products are available.

If some companies import fewer foreign goods this would increase demand for local products, which could also push up prices.

US retailers usually place their orders for Christmas early in the year, but it's had far fewer orders than normal as retailers wait to see what happens.

Despite debuting at number one, it left the Top 40 after two weeks, and has yet to be certified gold - meaning it has sold fewer than 100,000 copies.