Britain has remained in deflationary territory in October, as the cost of fuel and food continued to fall.
But what is deflation and should we be worried about it?
Deflation is a prolonged period of falling prices relative to a year earlier.
In other words, it means the prices of goods and services are falling.
It is rare for Britain to see deflation.
When it struck in May this year, it was the first bout of falling prices for more than 50 years.
Most economists are optimistic about the current spell of weak prices. They think it has been driven by a fall in oil prices, so an external force, rather than any problem related to the UK economy itself.
It's also good for consumers as it means they have more money in their pockets and may spend more, triggering gowth. That in turn could make consumers more optimistic and lift consumer confidence.
Is there a downside then?
There is a niggling issue with deflation. If people expect prices to continue falling they may stop spending and employers may give workers lower wage rises.
That could lead to a negative spiral of stagnation.
This is expected to be a short-lived turn into deflation, with prices expected to start rising again in the near future.
Overall, commentators expect it to deliver a boost to the economy rather than be a drain on it.