Why are fuel and petrochemical prices outpacing crude – and how long will it last?

This summer, David Chen, a Chinese national living in Japan, got an unexpected lesson in global industrial supply chains – delivered through a bag of potato chips.
When popular Japanese snack brand Calbee replaced its signature colourful packaging with monochrome designs, Chen initially assumed it was a marketing gimmick. “Then news reports explained the switch stemmed from a naphtha supply crunch. I even looked up the word,” Chen said.
Naphtha, a flammable liquid processed from crude oil, might...