Le premier se rapporte à la plainte qu'on entend souvent, de la part du public : quand le prix du brut augmente, on constate une augmentation du prix de l'essence mais quand le prix du brut descend, il n'y a pas de baisse correspondante du prix de l'essence.
The first one relates to the common complaint you hear from a number of people, which is that if the price of crude oil goes up, they see an increase in the price of gasoline, but when they see a decrease in the price of crude, they do not see a corresponding decrease in the price of gasoline.