美国12月谘商会消费者信心指数为89.1，预期91，前值88.7

Group 1 - The core point of the article is that the Consumer Confidence Index in the U.S. for December is reported at 89.1, which is below the expected 91 and slightly above the previous value of 88.7 [1] Group 2 - The Consumer Confidence Index is a key economic indicator that reflects consumer sentiment and can influence spending and investment decisions [1]