Ann Davis has this report on an aspect of the selling in the crude market.

Christopher Peel, chief executive officer of London asset-management firm Blacksquare Capital LLP, which launched a new fund of commodities-focused hedge funds in June, says a big contributor to oil’s slide has been momentum trading by computer-driven commodity trading advisors.

Natural gas was cheaper on a relative basis than crude, but instead of rallying, the sell-off in natural gas accelerated.