Answer: increase in real interest rate
Step-by-step explanation:
Negative inflationary surprises lead to an increase in the real interest rate. The real interest rate is simply defined as the rate of interest that a saver, investor, or a lender will receive after inflation ahs been allowed.
It should be noted that the real interest rate is the nominal interest rate minus inflation. Therefore, a negative inflationary surprises lead to a rise in the real interest rate.