He didn't really do a fair comparison. He said in the article that US diapers tend to last 4-6 hours where as he went for the European mindset of 8-12 hours. He then compared it to having to use 6 US style cheap ones to using 2 European style diapers per day. He used the low number (4 hours) for the US cheap diapers (4 hours x 6 diapers = 24 hours). Then he used the high number for the European diapers (12 hours) for the European diapers (12 hours x 2 diapers = 24 hours). When in reality he should of either used 6 hours for US diapers or 8 hours for european diapers to make it fair. So what it should be is 8 hours x 3 diapers = 24 hours. For a final comparison of 6 diapers to 3 diapers per day, instead of 6 to 2.
Which inturn makes the European style diapers actually cost 90 cents more per day than the US diapers, because it now costs $4.50 instead of $3.00 going by his numbers (1.50 x 3 = $4.50 per day). Compaired to the 60 cents per diaper he used for the US diapers (0.60 x 6 = $3.60 per day). Hence costing 90 cents more for the European diapers ($4.50 for European - $3.60 for US = $0.90).
I still agree with him other than that, I just wanted to point that out.
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