Into my email box, just a few minutes ago.
“Trade negative” means at a price LESS THAN ZERO.
I am reminded of Ezechiel chapter seven…
Their silver shall be cast forth, and their gold shall become a dunghill. Their silver and their gold shall not be able to deliver them in the day of the wrath of the Lord. They shall not satisfy their soul, and their bellies shall not be filled: because it hath been the stumblingblock of their iniquity.