The Consumer Price Index (CPI) is an often-used gauge of inflation in the U.S. economy. On December 10, 2021, the CPI rate was a blistering 6.8 percent year-over-year (YoY), more than triple the Federal Reserve’s 2 percent target and its highest level since 1982. Even though energy takes up less than 8 percent of the typical household expenses, it accounted for 30 percent of the YoY gain. Vehicles, shelter, and food were the next biggest contributors to the CPI. Along with energy, those four inputs represent almost 61 percent of consumer purchases but account for 81 percent of the YoY…