There's also no unlimited downside in finance -- eventually you can't take out more debt, can't pay the interest, and default (creating counter party risk). I

There's also no unlimited downside in finance -- eventually you can't take out more debt, can't pay the interest, and default (creating counter party risk). I suppose net across the system, you could inflict more downside to others exposed to your default, but it's not unlimited unless you can wipe out the entire planetary economy (financial and non financial) with your bet.