Vandana Hari is founder of Vanda Insights, a Singapore-based global energy market intelligence provider.
Producers group ought to respond quickly to signs of supply-demand imbalance

A tanker unloads its cargo of imported oil at Yantai, China in June: The country is the world's largest net buyer of crude. (FeatureChina via AP Images)
Vandana Hari is founder of Vanda Insights, a Singapore-based global energy market intelligence provider.