Denmark Faces ‘Out of Control' Housing Market

"To be concrete, there is a danger that Danes go blind to the risk of rates ever rising again," Tore Stramer, chief analyst at Nykredit in Copenhagen, said in an e-mail. "That raises the risk of a major housing price decline, when rates at some point or other start to rise again."

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With no other country on the planet having experienced negative rates longer than Denmark, the distortions the policy is wreaking may provide a preview of what other economies face should they go down a similar path. Danes can get short-term mortgages at negative interest rates, and pay less to borrow for 30 years than the U.S. government.