‘In China, authorities employ an index of the sales of pickled mustard tubers (a food favored by its working class) to track ……

“‘In China, authorities employ an index of the sales of pickled mustard tubers (a food favored by its working class) to track … migrant workers’”

–Cory Dillow, ‘How Waffle House Became A Disaster Indicator For FEMA’ (2013)