Deprecated function: Optional parameter $path declared before required parameter $arg is implicitly treated as a required parameter in include_once() (line 1439 of /var/www/quickstart.cals.arizona.edu/includes/bootstrap.inc).

Episode 993: Negative Oil | Planet Money

This past Monday, the price of a barrel of oil in the United States fell below zero. Specifically, it fell to negative $37 a barrel. This is not normal; it has never happened before. Until a few days ago, it didn't even seem possible.

Today on the show: What just happened to the price of oil, and what does it tell us about the world?