Essentially it is the lowest the unemployment rate at which inflation rate remains steady.
The last year in which inflation topped 3.5percentt was 1990, when it reached 6.1percentt.
The degree to which inflation actually materializes will clearly play a role.
In an economy in which inflation has been held down, that would always eventually prove unsustainable.
These were the seeds from which, inflation predicted, large cosmic structures would eventually grow.
11.07am GMT The key issue, says Carney, is the time period over which inflation must return to the 2% target.
The pattern originated in the quantum fluctuations from the big bang, which inflation blew up to much larger sizes.
And the break-even point, at which inflation neither accelerated nor decelerated, was an unemployment rate of around 6percentt.
An economy has been created in which inflation, otherwise frowned upon, is desirable in house prices, even essential.
However, the data suggests that we are still well short of reaching the point at which inflation becomes a threat.
But the consumer-price index by which inflation is measured does not include rising prices for financial assets.
