Ah, I was thrown by the word "worth". You are correct, not that you needed to hear that from me.
It is till it gets deposed.... The trick is knowing when to "cash in". pun intended.Apparently cash is not king.
Every central bank has a target rate of inflation that eventually devalues the currency towards 0 over time. It's a way to keep people spending money today instead of saving it for tomorrow and stimulates the economy.
I really don't see what's shocking about all of this. As well as the claim that this is something "they don't teach at school". This is common knowledge.
The Bank of Canada target rate of inflation is 2%. It even says so right on their website:
http://www.bankofcanada.ca/core-functions/monetary-policy/inflation/