Spokeswoman Elvira Swanson notes that the company has more than 1.8 billion cards in circulation and is active in more than 200 countries around the world.

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Cost is often cited as a reason for this reluctance, but a study published Tuesday by UPenn researchers in the journal Circulation finds that cooling is more cost effective than many established medical therapies.

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More money in circulation means more inflation down the road, potentially a lot more than the 2% the Fed is planning on.

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Besides that magazine, some of those photos also were published in the Irish Daily Star newspaper and Chi, which according to its parent company Mondadori is a women's magazine with an average circulation of more than 218, 000 and a readership well beyond that.

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This was inevitable: airlines have been issuing so many miles (for spending on the ground as well as in the air) that the total stock is worth more than all the dollar notes and coins in circulation.

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There are 59m credit cards in circulation, more than in the rest of Europe combined and the card industry is fragmented with more than 60 different issuers.

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The fact that so few tablet owners are buying magazines on their devices is a concern because both ad and circulation revenue from print editions have fallen more than 20 percent since their peak near the middle of the last decade.

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