The discount did rise $10 when the cap came into effect.
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I don't think you understand.
Russian Urals Barrels no longer use the Bloomberg Urals Crude Quote as the pricing mechanism for selling Urals crude.
The Bloomberg Urals Crude Quote (which is the only Urals Crude Quote), is what the Russian Government used to set oil taxes at before recently, but it is gathered by asking traders.
The traders no longer have a market incentive to tell Bloomberg the real Urals Crude price for them to produce the Urals Crude Quote.
Essentially, both sides get what they want.
The Europeans can pretend that their price cap is working, while the Russian Oil Companies can also pretend that the European oil price cap is working, and thereby pay less in taxes on the real price they are selling their Urals crude at.
This does not mean that the real price that Urals Crude is being traded at is the price that the Bloomberg Urals Crude quote shows.
This is classic market price signal destruction.
The price cap in reality has made the real Urals Crude price being traded at a secret price.
The Bloomberg Urals Crude quote hasn't been anywhere close to accurate ever since the sanctions started in February 2022.
The stigma from trading Russian Urals Crude started in February 2022.
This caused the traders of Urals crude to not actually have an incentive to report the real price of Urals crude to Bloomberg even back then.
The real discount was never as high as the quote showed.
The quote simply became even less real after the price cap.
The Urals crude discount is currently higher than the ESPO discount, but unknown how high the discount is, but it's not higher than 10 dollars in reality.
The only way to calculate how high the Urals crude price really is is to get Russia's 2023 oil tax revenue after they implement the change to Brent and Dubai plus discount as the tax price mechanism from the current Bloomberg Urals Crude Quote as the tax price mechanism.
This is assuming that they don't make that data secret from now on to discourage further sanctions.