Who is reaping the monopoly profits from gasoline differentation?
In principles, we teach students that one of the points of differentiating your product is that it allows you some latitude to act as a monopolist. That's desirable because it allows you to potentially sell your product at a price above marginal cost, thus making profits. However, differentiation is not a sustainable way to make profits because other folks can create substitutes that are differentiated, and eventunally drive your demand down to the point where your profits are zero.
At least, this is how it works in free markets.
But, the market for gasoline is not free. One of the many manifestations of that is the differentiation of what is otherwise a fairly fungible product by government regulation. Here is a map of the different blends of gas required in the U.S.
An additional way in which the market is not free is that the producers are not the ones creating this differentiation, the government is. So, there is no free entry to push profits towards zero.
The thing is, I know of no research that suggests that the source of differentiation influences the ability to make profits. Differentiation leads to some ability to price above marginal cost ... period.
But, it can hardly be the oil companies that are profiting from this because they have to incur higher marginal costs in order to produce these differentiated fuels.
So, where do the profits go? This is closest to the textbook case of a lazy monopolist - one that does not keep costs down because it doesn't have to. This leads me to conclude that what we have here is the government awarding monopoly power to politically connected vendors.
Hey ... wasn't that part of the economic model of fascism? (Sorry ... I forgot that environmentalists are among the annointed).
Via Heavy Lifting.