Britain, along with much of the rest of the world, has become used to ultra-low interest rates.
That era could be at an end as the Bank of England weighs up scrapping its pandemic-era emergency low rates of 0.1pc.
The first step is expected to be an increase to 0.25pc, a return to the rate introduced after the Brexit vote.
Financial markets then anticipate another rise to 0.5pc, probably in December or February. That would match the level to which rates were cut when the financial crisis struck.
A further increase to 0.75pc, predicted for March or May, would match the highest levels reached since the credit crunch, only matched in moments of cautious optimism in the year or two before the pandemic.
The real break with that pattern is anticipated next summer, when traders expect rates to rise to 1pc – a level not hit since 2009.
The aim is to tackle inflation and to recognise that the economy should be bigger than it was before Covid came along.
Rates could rise a touch further later this year, with markets recently predicting 1.25pc.
By the standards of the past decade this is dramatic stuff given that rates have not been above 0.75pc since March 2009. It raises the question of how high they could go.
The rule of small numbers means any change looks enormous. Raising rates from 0.1pc to 1pc is a ten-fold increase, which has never happened in the Bank’s long history.
That points to the key issue when it comes to the current fraught debate on interest rates.
Even if they do rise to 1pc or a little higher, this is still extremely low by traditional standards.
Between 2000 and the financial crisis, rates bounced around between 3.5pc and 6pc.
In the 1990s, they ranged between 5pc and 15pc, in part because Britain was fighting to keep the pound strong as it sought, without success, to stay in the Exchange Rate Mechanism, a forerunner of the euro.
Prior decades were similarly tumultuous as policymakers used brutally high interest rates in an effort to tame inflation, which had run wildly out of control to peaks of more than 25pc in the 1970s and more than 20pc in the 1980s.
The base rate spent years at a time in double figures, sometimes with multiple rate changes in a single month.
The chances of a return to this historic volatility seem remote, but the Office for Budget Responsibility has recognised there is at least a possibility – or a risk for borrowers – of a tip back to something like normality, if the Bank of England has to take more serious action to battle inflation.
The Office for Budget Responsibility warned of the possibility that “inflation may prove more durable, especially if people come to expect high inflation to continue and businesses raise prices to protect their profit margins or workers demand larger wage increases to maintain their purchasing power”.
Such a wage-price spiral could, in what the officials describe as “stylised and deliberately stark scenarios”, send inflation to something like 8pc if the Bank does not act hard to control price pressures.
In that eventuality interest rates could rise to above 3pc, in an uncomfortable shock for families and businesses used to more than a decade of previously-unprecedented low borrowing costs.