Money & WorkFact
3% interest can still be a loss.
The nominal rate is the number the bank advertises. The real rate is nominal rate minus inflation, and only it tells you whether you're getting richer. Earning 3% interest with 4% inflation gives a real rate of about minus 1%: your balance rises, but you can buy less than before. Conversely, 1% interest at 0% inflation is a genuine gain.
Useful: A savings account only pays off when its rate beats inflation.
Source: de.wikipedia.org