How it works
Nico's jar of 60 coins never lost a coin. But each year a bun cost a little more, so the coins bought less.
Grown-ups call prices creeping up a little each year inflation.
Gran's made-up garden adds one new coin for every ten inside each year, so coins can climb the way prices do.
Real investments are not so smooth. Some years they grow and some dip, and growth is never promised. That is why investing is for coins not needed for a long while.