I believe wealth transfer is not the right terminology. Short to medium term economic leverage would be more appropriate, IMHO. Producers have temporarily lost the upper hand, while over capacity allows consumption growth that would not have been possible otherwise. The opposite mouvement that strong demand and restrictive policy caused pushing prices to incredible heights not too long ago. That enticed a ramp up of less economical production such as tar sands and fracking. The pendulum will swing, it's 100% certain, the key to profit from it is to time that swing... to see the signal in macro factors, some of which are alluded to in the article.