Regular

“The world is full of things worth more than gold. But we dig the damn stuff up and then bury it in a different hole. Where’s the sense in that? What are we, magpies? Is it all about the gleam? Good heavens, potatoes are worth more than gold!”
“Surely not!”
“If you were shipwrecked on a desert island, what would you prefer, a bag of potatoes or a bag of gold?”
“Yes, but a desert island isn’t Ankh-Morpork!”
“And that proves gold is only valuable because we agree it is, right? It’s just a dream. But a potato is always worth a potato, anywhere. Add a knob of butter and a pinch of salt and you’ve got a meal, anywhere. Bury gold in the ground and you’ll be worrying about thieves forever. Bury a potato and in due season you could be looking at a dividend of a thousand percent.”

– Rincewind has always known potatoes are worth more than gold |
Terry Pratchett, Making Money