WASHINGTON — The U.S. December consumer price index was up 0.3% and the core rate rose 0.2%, a little worse than expected. Underlying price details are even scarier.

Over the year CPI posted a 4.1% rise, its biggest advance since a 6.1% jump in 1990. Core posted 2.4% higher over the year. Unrounded core CPI was up 0.2422% for December, a high reading and a bond-market negative.

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