Back in February 2015, the price of West Texas Intermediate stood at about $52 per barrel, half of its 2014 peak. I argued then that a renewed decline was coming that could drive it below $20, a scenario regarded by oil bulls as unthinkable. But prices did fall further, dropping all the way to a low of $26 in February. Since then, crude rallied to spend several weeks flirting with $50 per barrel, a level not seen since last year. But it won't last; I'm sticking to my call for prices to decline anew to $10 to $20 per barrel.

Recent gains have little to do with the fundamentals that led to the collapse in the first place. Wildfires in the oil-sands region in Canada, output cuts in Nigeria and Venezuela due to political unrest, and hopes that American hydraulic fracturing would run out of steam are the primary causes of the recent spurt.

But the world continues to be awash in crude, and American frackers have replaced OPEC as the world's swing producers. The once-feared oil cartel is, to my mind, pretty much finished as an effective price enforcer. Even OPEC's leader, Saudi Arabia, is acknowledging the new reality by quashing recent attempts to freeze output, borrowing from banks and preparing to sell a stake in its Aramco oil company as it tries to find new sources of non-oil revenue.