According to this study - American consumers are really stupid. They can't do math, are easily persuaded, and emotional, to boot!
CT: It turns out consumers can be tricked into buying, they make poor choices because they're bad at math, and many people shop with their heart rather than their head. Those issues and more account for poor money decisions people make every day. Consumer behavior has become a fascinating area of academic study. The practical application of many studies is to advise marketers on how to increase sales by better understanding consumers and, in some cases, manipulating them.