Pretty much everything ‘depreciates’ due to inflation. Yes, you can beat deflation by getting a savings account, CD, MMA that has a higher yield,but good luck finding one. I believe the current deflation rate is somewhere in the 3-3.5% area.
Say a person has $1M. Say the deflation rate is 3.5% per year. For each day that that person does nothing at all, they lose almost $96. Yea, the bank account will still say $1M, but the worth of the $1M goes down.