“…The CPI evolution for the six considered countries (Germany, Spain, Slovenia, Romania, Lithuania, and Greece) differs greatly from one case to another. Since we are interested in the dependence of the Core Price Index (without the volatile components introduced by the change in food or energy prices) on the succession of pandemic waves, we Notable is the fact that the model does not take into consideration the eventual political decision of OPEC to raise or reduce oil production [28,29], nor of Russia's political influence on oil prices or, alternatively, the demand-side alteration of countries in the EU towards Russian petroleum [30,31], which can be seen in the last months of the data simple The negative value of the c5 coefficient corresponds to a reduction in the rate of increase of the oil price.…”