This is a salient example of how misleading the ordinary least square estimates can be. Easter effect variable has an increasing positive effect from lower quantiles to upper quantiles. It is almost significant for all quantiles except 0.5 quantile. The OLS regression strongly overestimates the effect of Easter variable than the median quantile estimate. The school vacation estimate is not different from zero for any quantiles except 0.3 and 0.05 quantiles and has negative effect on the sales. The relationship between the sales and before holiday variable is positive. The effect of before holiday is significant for all quantiles and increases from lower quantiles to upper quantiles. The Austrian holiday variable has a negative effect and is significant from 0.2 to 0.8 quantiles. It has a decreasingeffect from lower quantiles to upper quantiles. The after holiday variable is not different from zero in most of the quantiles except 0.05, 0.4, and 0.8 quantiles.