While NPD has point-of-sale information from over 1200 retailers representing 165,000 stores worldwide telling you what is selling, where, and at what price. They only considers a certain % of the retailers who sell consoles and software to the buying public.
There are many large retailers who dont report their sales to any company much less the NPD
They can be wrong take for example the wii it sold far more after launch than the NPD credited them for.
CONCLUSION I'm not attacking NPD and their knowledge on market trends....but i will say that there is far more wiggle room in their accuracy than people on these forums seem to think.
But coming into general games discussion and pointing out the inaccuracies of NPD figures amounts to going into a catholic church and telling priest jokes... you're not going to get a warm welcome here
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