 Interest rate changes often cannot keep up with hyperinflation or even high inflation, certainly with contractually fixed interest rates.For example, in the 1970s in the United Kingdom inflation reached 25% per annum, yet interest rates did not rise above 15%—and then only briefly—and many fixed interest rate loans existed.Contractually, there is often no bar to a debtor clearing his long term debt with "hyperinflated cash", nor could a lender simply somehow suspend the loan.