I just saw the economic data from the United States, and the core PCE price index is quite important. Simply put, it is a key indicator for measuring inflation in American consumers' spending, and the Federal Reserve has been using it as the main reference for inflation since 2002.

The recently announced December core PCE annual rate rose from 2.8% to 2.9%, indicating that inflationary pressure is still present. This PCE corresponds to personal consumption expenditures, published by the U.S. Bureau of Economic Analysis, and is basically the most direct indicator reflecting changes in consumer prices.

For traders, fluctuations in core PCE data often influence the Federal Open Market Committee's decisions, thereby affecting the direction of interest rates. So when such inflation data is released, market reactions are usually significant.