Definition
Month over month compares with the month before. Year over year compares with the same month a year earlier.
The story
On Oct 14, 2026, CPI (Consumer Price Index) showed prices up 0.6% from August and 3.7% from a year earlier. Same report, two numbers, two questions answered: how fast prices moved this month, and how far they've climbed over the year.
Why markets watch it
Every forecast is for one or the other, so you have to know which one a headline means.
Connects to
Last seen in
We explain why it moves markets. What you do with it is your call. Commentary and education only. Not financial advice. All terms