This blog will contain lots of data about prices and you might wonder how do I actually get the data and can it be trusted as accurate. The prices are based upon a propriatery equation I have developed that takes into account actual prices gathered from Amazon, Half, Ebay, and JJGames. I can’t tell you the exact equation because it is a trade secret, but I use it at www.jjgames.com to determine our prices so I definitely believe it to be THE price.
I have daily prices for thousands of games using this equation, but most of the blog posts and graphs will use 7-day averages instead of the daily prices. I do this because daily prices for video game are really volatile and a 7-day moving average gives a better indication of where the prices are going. Below is an example for daily prices vs the 7-day moving average for Super Mario 64.
When I show charts in future blog posts, the price will be the 7-day moving average NOT the daily price. I think this helps a lot with comparisons between different video games and allows easier discussion on trends, which is what this blog is all about.