Why may revenue fluctuation occur?

There may be different reasons, if the fluctuation occurred at the beginning of the quarter it is most likely related to seasonality. At certain times of the year, advertising revenues can rise or fall due to several factors, among them we find market trends and advertising spending strategies. Brands plan their advertising strategy by dividing the year into four quarters, with the first and third quarters being those in which revenues are lowest, and the second and fourth quarters being the most profitable for publishers.