Could you tell me the number for ? http://maysfreshflowers.com.au/stmap_53g4wy.html?cialis.pfiagara.methotrexate medcom.pl  So why do they do it? As Yellen and Adams note, a lot of economists have argued that this has to do with complementarity ﾃ｢ﾂ�ﾂ� it makes sense to sell goods that complement each other as a bundle ﾃ｢ﾂ�ﾂ氾つ�or with cost savings that comes from producing and selling these things together. They argue that a third, more nefarious explanation is at work: price discrimination. Bundling, they argue, allows businesses to split up customers into separate groups, and offer different bundles, with different prices, to each. That allows for a degree of price variability between customers that's unusual in consumer products, which helps out businesses.