Whenever they eventually do. That from a study of economic inflationary/deflationary cycles going back some 700 years. The current real-rate deflationary period is the second longest of the past 700 years.
"On aggregate, then, the past 30-odd years more than hold their own in the ranks of historically significant rate depressions. But the trend fall seen over this period is a but a part of a much longer ”millennial trend”. It is thus unlikely that current dynamics can be fully rationalized in a “secular stagnation framework”. Meanwhile, looking at past cyclical patterns, the evidence suggests that when rate cycles turn, real rates can relatively swiftly accelerate."
https://bankunderground.co.uk/2017/...e-1311-renaissance-roots-and-rapid-reversals/
"On aggregate, then, the past 30-odd years more than hold their own in the ranks of historically significant rate depressions. But the trend fall seen over this period is a but a part of a much longer ”millennial trend”. It is thus unlikely that current dynamics can be fully rationalized in a “secular stagnation framework”. Meanwhile, looking at past cyclical patterns, the evidence suggests that when rate cycles turn, real rates can relatively swiftly accelerate."
https://bankunderground.co.uk/2017/...e-1311-renaissance-roots-and-rapid-reversals/