Rath on 10 February 2009
Now it probably is overtracked but there are many mitigating factors.
1. NPD isn't perfect. Their figures are not 100% perfect and they do not release information on changes to past figures.
2. There is a margin of error for all sales tracking. VGC will not get it perfect either.
3. NPD only tracks one market in the region (albeit the major market) therefore VGC being somewhat over should always happen. I think I heard 10% for Canada, 5% for Mexico and 5% for South America at one point?
