This has come up a number of times and seems like the sort of things that engineers might study, hence the choice in forums. Consider the total energy invested in any system or device; call it a product. Be it a dam, a nuclear power plant, a car, or a birthday cake, there is necessarily a relationship betweeen energy invested and the final price of that product. For example, if we consider the user level price and the energy invested in an aluminum can, knowing that aluminum requires a great deal of energy to produce, it seems reasonable to assume that most of the production price represents the energy invested in the can, and then we allow for some multiple of that as a point of sale vs production price, rate of profit. But even labor intensive products represent an energy investment. That is to say that a person has some measure of energy efficiency, and normally we need things like light, heat, [coffee], we have to drive to work in a car that has a finite lifespan and that requried energy to produce, and that requires fuel, tires, oil, etc. So it starts to appear that a standard relationship might exist. So, is there a known or typical relationship between price and invested energy, in any product, in joules per dollar?