system
Given the following post, respond as if you're commenting on Reddit:
human
[General Fantasy] How, physically, do dragons hoard gold?

You always see dragons sitting on huge piles of gold coins and gems and things.  But compared to your standard dragon, these things are _tiny_.  And dragon hands don't seem that dexterous usually.  How does the dragon actually get them all into a pile?  How does it pick them up and move them?
gpt
In the old days, they would fly around collecting individual coins in their hands, and taking them back to their cave.  Particularly industrious ones would lift up entire carts or boxes full of gold.

Later, they discovered that they could simply threaten humans with burnination, and in exchange for *not* destroying all of the human homes and eating all of the human maidens, the humans would bring gold to the dragons.  This worked out well.

*Still later*, one dragon was surprised when, instead of gold, the humans started trading around little bits of paper.  All of the gold started being stored in buildings and never moving!  "You there, human!"  He said to one of them, "Why are the humans just giving you gold in exchange for bits of paper?"

The Banker explained gold-backed currency to the Dragon, and the dragon was delighted.  He promptly ate the banker, stole his gold, and flew off to his cave.  Later dragons learned from this example, started their own banks, and issued their currency.

This is where the US dollar acquired the nickname, "Greenback" - after the green scales of the Dragon who runs the Federal Reserve.