Earlier quoted context omitted.
> The above model is oversimplified and wrong. Can you share anything that would help us commoners reading internet comments understand why the analysis is wrong?
There are more than 2 markets. The dominating factors change based on market conditions.
Every market that enable trade gambling is bound to be volatile and sometimes disconnected from reality. Gamblers that manage to to accurately estimate this delta are the winning one.
PS: Actually that's how you end up with negative price, a gambler acquired a huge quantity of gaz in the future market hoping to sell it even higher on the daily market. Nice weather daily market drop. He end up selling negative because he's just a gambler living in NYC and he don't have any usage for the gaz he own in a ship ready to deliver in the European northern sea. So he is ready to pay to get away of this deal and soon enough he is ready for his next sad gamble...