translation.en: Now, similarly, the old story about oil is that if we wanted to save very much of it, it would be expensive, or we would have done it already, because markets are essentially perfect.
translation.zh: 现在，对于石油我们有着同样的老看法。如果我们想节约石油 那就要花很多钱，要不我们早就成功了， 因为市场基本完善。