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Nuvendil said:
librarian13579 said:

You can take the "estimate" part with a grain of salt. It's pretty much just straight sales data.

This is how it works:

1) Every month, NPD gets direct, point-of-sale transaction data from all of the major retailers and all of their online websites. That's 95% of the market.

2) Then, NPD gets direct data from another 2% of smaller retailers.

3) The remaining 3% NPD estimates with algorithms.

We as consumers collectively generate 97% of NPD's data, so I do feel like it's something we should have access to.

A long long time ago, we used to get some direct data....before some of the retailers / third-parties started complaining, that is.

True enough.

But might I ask, why should this information be available?  On what are you basing this perceived right?  Because we bought the products?  The purchase is an exchange of money for a product or service.  It only gives the right to use or own that product or service.  In what way are consumers harmed in any capacity by sales data of this nature not being public?  I mean, publicly traded companies have to divulge their sales anyway quarterly.  Beyond our own ammusement or hobby of tracking sales, what does this information give us? 

A better question is why the companies should have the right to hide it because that is what is happening.  Hardly no other industry does this.