Compared with international oil prices, domestic oil prices have always been rising fast and falling slowly, one of the reasons is that China's refined oil price adjustment is based on the boundary condition that crude oil prices in the three regions change more than 4%  For example, when we went from $100 a barrel to $104, we followed suit  However, a 4% pullback from $104 would take the price back down to $99,
The above argument fails to show that the higher the oil price, the slower the domestic response, with 4% as the boundary condition.
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