No, I make no such assumption. I said that I made up the numbers. And it's an example.
On the larger scale, he doesn't just use the same amount of road. He uses more of the total infrastructure, some of it direct, some of it indirect because of the effect on others within the economic chain. In reality, we can't break it down to units of road or units of electricity but we can generally break down that it takes more inputs to increase outputs. And those who are using a greater percentage of the inputs, in aggregate, are expected to pay a tax that reflects that.