Busty brainless usually refers to women with a nice figure, often not too smart. This word actually comes from an ancient princess, whose brain is very smart, but the figure is not good chest flat, so very jealous of the more full-breasted ladies. So she was on tour, going around to promote her smart because her chest is small, she has seen the chest is very large people, its intelligence is often low, so there will be a big chest brainless word, of course, this is just a folk tale. On Alibaba once made statistics for cups, often more than B cups of ladies spending power is higher, but I think this is also biased. After all, underwear is a non-returnable, non-exchangeable goods, cups a little larger, smaller breasts can also be worn, so some consumers may buy a larger cups, but of course, this is just a guess on my part. A scholar in Chicago, USA has done a study on this, ladies with large breasts tend to have an IQ rating about 10 points higher than ladies with smaller breasts, so it is often said that women with large breasts are more intelligent. Since women with larger breasts produce a relatively higher amount of estrogen, it will promote the development of intelligence. At the same time, smart men tend to like women with large breasts, so the next generation of children not only inherited the father’s IQ, but also inherited the mother’s good figure, so that women with large breasts are more intelligent. Of course, all of the above, is basically some speculation or inference, the experiment is also because the sample size is relatively small, I think it can not be generalized, we can right as a laugh after dinner.