U.S. consumer prices increased in December, lifted by higher costs for rents and food as some of the distortions related to the government shutdown that had artificially lowered inflation in November unwound, cementing expectations the Federal Reserve would leave interest rates unchanged this month. Nonetheless, expensive food, with prices increasing by the most in more than three years, and rents underscored the affordability crisis facing President Donald Trump, partly blamed by economists on the White House's policies, including sweeping import tariffs.