A music magazine has had steady business with the current 45 to 65 year old demographic, because of its coverage of “classic rock”, as it has aged from youth to middle aged. The magazine has also needed to continually reach out to the current youth of each era and maintain their interest and so has covered the main trends in the wide scope of music trends in popular music that have developed since the advent of rock and roll. Discuss what kind of data you believe would be necessary to determine the optimum ratio of coverage between the different niche markets.