I think since there are 12 months for a 52 week year, instead of 13 four week months for a 52 week year, there is a cycle in planning for each of the big three, and since odd and even numbered weekly month lengths come predictably, there are different amounts of a console produced each week because the production has to be matched to big games, price cuts, holidays, etc.
So instead of thinking well 1.8 million * 12...divided by weeks
(21.6 million) / (52) which is 415.384k per week produced
You have to look at it as something like:
21,600,000 = (5 weeks)(x normal demand)(4) + (4 weeks)x normal demand)(2) + (43 weeks) (x normal demand)
Basically: December/Jan Nov/Apr Rest of the Year
21.6 million = 20x + 8x + 43x
(Dec/Jan are peak periods in the USA & Europe, Japan respectively, November and April are secondary peaks - with November huge in the USA, and April bigger than normal usually in Europe and Japan for Golden Week & Easter)
So in reality:
21,600,000 = 71x
Which would mean in reality only 300k Wiis are being made right now, but the average will equal 1.8 million/month by year end if Iwata keeps Nintendo at 1.8 million Wiis made per month in 2008
...if you could somehow move April in Japan and Europe (not as big as in Japan) and Nov in the USA and Europe (not as big as in the USA) to the same period worldwide, and have January in Japan when the USA/Europe have December boosts
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