It depends. You see, there are a couple of key things to remember:
Energy is not a free lunch; it has a cost.
Energy is a resource.
So, if one of your energy sources isn’t available or cheap, your flight will be slow and inefficient and you’ll burn a lot of fuel, and therefore you’ll have to carry less fuel for the plane’s average flight distance. Or you’ll overheat, potentially causing your machine to crash, and the whole plane to burn to the ground. Even if there were some energy available.
If two energies are available, they’ll have different physical properties and be therefore slightly unequal in power, which will result in an uneven distribution of energy from those two energies, which means that they will have a different physical properties and be consequently slightly unequal in power. So, energy is something you can’t just give away to someone – that’s why we need to have a balance between available and cheap, and even when it comes to flying there’s only one way to reach that balance and it’s not by just giving everyone money. You need to have someone (either a business or government) on the ground who has a vested interest in your energy production and who can make sure your machines are working properly and you don’t overheat.
You don’t want a world where all energy is free but not usable
In fact, there’s quite a lot of evidence which shows that the amount of energy used to fly a plane is a good indicator of how efficient it is at producing that energy, and that the more energy it uses to fly the worse it might be at converting what they produce to usable energy. This is also true in many other goods. For example, on your commute to work you’ll need to use more fuel to pull your car up to a certain speed – because it doesn’t take much energy, you’ll need as much fuel on your journey as it takes to get there. And, if it takes as much energy as it takes to produce the fuel – which is probably not the case – then the amount you actually use and don’t use, can be quite variable, and that’s very bad for efficiency, and also bad for the economy, because if demand is low and that means prices go up you can have people using more energy because they need to to produce goods than they would use otherwise. But if demand is high and prices go down then less of the energy you need in the first place goes into production, less is
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