Inflation Erodes Cash
Is money under the mattress actually safe?
The idea
Cash keeps its number and loses purchasing power as prices rise, so holding it has a real cost.
In the real world
A balance unchanged for ten years buys noticeably less at the end.
Going deeper
Cash keeps its nominal value and loses purchasing power as prices rise. Holding it is therefore a position with a real cost, not a neutral absence of one.
The loss is invisible because the number on the statement only ever goes up. Savings at 1% against 4% inflation grow nominally and shrink by roughly 3% a year in what they can buy, and that shortfall surfaces as things costing more rather than as anything attributed to the account. Comparing the rate on your savings with the inflation rate is the whole of the diagnosis.
Where it stops applying
Cash held for a specific near-term purpose or as an emergency fund is doing a job that outweighs the erosion. The concern is long-term holdings sitting in cash by default.
Why it matters
It shows that doing nothing with money is itself a position, not a neutral choice.
Try this today
Compare the rate on your savings with the current inflation rate.
Test yourself
Someone holds savings in an account paying 1% while inflation runs at 4%. The balance never falls. What is happening?
Show the answer
The nominal amount grows and the real amount shrinks by roughly 3% a year. Because the number on the statement only goes up, the loss is invisible; it appears as things costing more, which is not attributed to the account.
Learn this in the feed Answering from memory, then again days later, is what makes it stick.