Bloomberg: What kind of oil should we buy? Luo Xiaohua shouts to her cousin from the cooking oil aisle in Yonghui Supermarket in the heart of Chongqing, a rising Chinese megacity. Luo, 50, is the quintessential Chinese shopper. She earns $3,250 a year and has an elementary education. Shes fiercely opinionated about her purchases.
Luo stands before amber-hued bottles loaded with a commodity that fuels Chinas and Indias growing consumer classes. From what I understand, all of these brands contain palm...