Food and gasoline was especially challenging. Many people who had previously lived off their retirement income and a little interest, had to start liquidating more and more of their principle, just pay for necessities.
Plus wages did not keep pace either. Any time inflation gets to double digits, the majority of people will be negatively impacted. Especially the poor, and middle class.
It is relatively easy to invest money to keep ahead of low inflation rates, but not runaway inflation. Rates on CD’s and savings accounts are typically tied to Treasuries, and usually pay less than those securities.
Rates on CDs in general are not enough to offset the rate of inflation, regardless of whether that rate is single or double digit. You have to invest elsewhere for that. I sincerely hope we never have to face such inflation again. It was a heck of a lot more destructive than you have stated.