Inflation has risen around the world, but the U.S. has seen one of the biggest increases

Americans who have been to the grocery store lately or started their holiday shopping may have noticed that consumer prices have spiked. The annual rate of inflation in the United States hit 6.2% in October 2021, the highest in more than three decades, as measured by the Consumer Price Index (CPI). Other inflation metrics also have shown significant increases in recent months, though not to the same extent as the CPI.

Understanding why the rate of inflation has risen so quickly could help clarify how long the surge might last – and what, if...