same thing, if it becomes so costly most can't afford to buy it, that is the same as running out. Didn't we already go through this when China had an endless supply of human energy to build walls and canals? They never did run out of humans, but hard today to get them to build another wall. Only the very wealthy can afford that kind of labor. So for all intents and purposes, we are out of cheap labor.We will never run out of oil. It will just become more costly to source and produce.