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How should I save money if the real interest rate (after inflation) is negative?
Inflation protected securities (i-bonds or TIPS).   TIPS stands for Treasury Inflation Protected Securities. By very definition, they tend to protect your savings against inflation. They won't beat inflation, but will keep up with it. TIPS or iBonds have two parts. A fixed interest part and a variable interest portion which varies depending upon the current rates. The combined rate would match the inflation rate. They can be bought directly from the treasury (or from a broker or bank who might charge a commission)