The Commensurate Sales to Popularity Concept (CSPC)
There are two ways to understand this revolutionary concept. The first is the Scribe video posted below. If you are unaware of the CSPC method, you will get the whole idea within just a couple of minutes.
If you are a mathematical person, and want to know the full method as well as formulas, you can read the the full introduction article.
Now let’s get into Green Day‘s detailed sales figures in order to apply this concept and define their true popularity!