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*sigh*. There's nothing wrong with the graph. No, it can go downwards because it's showing the progression of total downloads over a period of time. This graph can show negative trends though as much as positive ones, it's not some marketing magic eraser for negativity like you seem to present it as.

If app store downloads were slowing down, like let's say that 2008 would've seen more downloads than 2009 you would see slope's angle ease out over 2009 where it would be more abrut over 2008. This would be clear sign that something is wrong.

Are you Phil Schiller? If fewer apps are downloaded in 09 than 08, the angle would ease out, but it would still be pointing up. You and I would notice that, but to most people it still is going up so they would be impressed. A better graph would show downloads by week or month, not total downloads.
 
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