Oil prices have been persistently low for well over a year and a half now, but as the April 2016 World Economic Outlook will document, the widely anticipated “shot in the arm” for the global economy has yet to materialise. We argue that, paradoxically, global benefits from low prices will likely appear only after prices have recovered somewhat, and advanced economies have made more progress surmounting the current low interest rate environment.
Since June 2014 oil prices have dropped about 65% as growth has progressively slowed across a broad range of countries. This outcome has puzzled many observers who had believed that oil-price declines would be a net plus for the world economy, obviously hurting exporters but delivering more-than-offsetting gains to importers. The key assumption behind that belief is a specific difference in saving behaviour between oil importers and oil exporters [consumers in oil importing regions such as Europe have a higher marginal propensity to consume out of income than those in exporters such as Saudi Arabia].
World equity markets have clearly not subscribed to this theory. Over the past six months or more, equity markets have tended to fall when oil prices fall, not what we would expect if lower oil prices help the world economy on balance. Indeed, since August 2015 the simple correlation between equity and oil prices has not only been positive, it has doubled in comparison to an earlier period starting in August 2014.
One obvious problem in predicting the effects of oil-price movements is that a fall in the world price can result either from an increase in global supply or a decrease in global demand. But in the latter case, we would expect to see exactly the same pattern as in recent quarters, falling prices accompanied by slowing global growth, with lower oil prices cushioning, but likely not reversing, the growth slowdown.
Of course, it would be wrong to conclude that central banks can enhance the benefits of current low oil prices by raising their policy interest rates. On the contrary, all else equal, that action would harm growth by raising real interest rates, and the BoE [Bank of England] has absolutely no intention of raising interest rates.