zero inflation
Per the IMF: “ Inflation is the rate of increase in prices over a given period of time. Inflation is typically a broad measure, such as the overall increase in prices or the increase in the cost of living in a country.”
https://www.imf.org/en/Publications/fandd/issues/Series/Back-to-Basics/Inflation#:~:text=Inflation%20is%20the%20rate%20of,of%20living%20in%20a%20country.