The Sales of CD's and DVD's are an increasingly important way of showing people how much of a certain CD or DVD sold which then allows them to be able to see if anything is something they might want to initially buy, but this is also to show artists and or producers how much their CD or DVD is allowing them to improve on certain important aspects or to just generally keep things the same or similar.
A chart from 2008 and 2012 shown below:
This chart shares the amount of physical and digital purchase there were in 2008 and 2012 of music albums, video games and video's. These were the main categories of media which were put out within these times for physical and digital purchase.
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