Steve Ballmer may consider Mac sales to be a 'rounding error', but if that's true then they're a rounding error that's getting larger each year. In 2008, the NPD Group showed that 9% of households in America owned a Mac. Now the NPD Group's 2009 Household Penetration Study (via 9to5Mac.com) shows that Macs have grown by leaps and bounds in just one year. 12% of American households now own a Mac.
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However, the vast majority of those households are not Mac-only. 85% of Mac owners also own a Windows PC. In fact, 66% of Apple owning households own 3 or more computers. The reasons for this are fairly obvious. Only people with a fair amount of disposable income can afford to buy a Mac, and those folks often have money for a lot of gadgets.
In fact, the NPD survey showed that Mac owners were much more likely than non-Mac owners to also own an iPod or navigation system of some sort. 36% of Mac owners reported having household incomes in excess of $100,000 (only 21% of consumers make that much).
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One thing this study makes clear is that there are very few people who love Macs and Macs alone. With any luck, studies like this will help to quash those infuriating "Mac versus PC" commercials. That's probably too much to hope for, though. How else is Justin Long going to find work?