A very basic example of this would be the ratio given to sales and airplay.
During the Hot 100's early history, singles were the leading way by which people bought music.
The weekly sales period was originally Monday to Sunday, when Nielsen started tracking sales in 1991, but was changed to Friday to Thursday in July 2015.
The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine.
Chart rankings are based on sales (physical and digital), radio play, and online streaming.
On August 4, 1958, Billboard premiered one main all-genre singles chart: the Hot 100.
The Hot 100 quickly became the industry standard and Billboard discontinued the Best Sellers In Stores chart on October 13, 1958.
Although officially all three charts had equal "weight" in terms of their importance, many chart historians refer to the Best Sellers in Stores chart when referencing a song's performance prior to the creation of the Hot 100; until the start of the rock era in 1955, radio was still in its Golden Age, characterized more by spoken-word programs than music radio, and physical record sales were still the dominant indicator of a recording's popularity.