I read different papers which try to analyse the relationship between oil and macroeconomics with the help of a VAR model. The results are explained in graphics which show the impulse response functions. The question is now how to interpret the Y-axis. There is no graphic with an description of the Y-axis. I read in a learning book that it is in some cases only "how strong is the dependence of the variables " but in other cases it is the percentage of change in the variables. As example: 0.5 in period 1 = 0,5% change in variable x in period one / or only positive relationship.