Lower oil prices are putting increasing pressure on Arab oil producers, and many pundits have been quick to blame US shale oil producers for the decline in prices and in Arab oil revenues. This column measures how much the the shale oil boom contributed to the fall in the global price of crude oil. The Brent price of crude oil since 2011 would have been as much as $10 per barrel higher in the absence of US shale oil. But as large as this effect is, it pales in comparison with the decline in the price of oil that took place after June 2014, to which shale oil actually contributed little. The column goes on to discuss the policy options facing Arab oil producers.