Snack shelves have been looking pretty bare too, as shoppers stock up on treats for lockdown. Along with beer and chocolate, sales of potato chips in Spain are up 87.1% since lockdown began, according to Inforetail. In the US, potato-chip sales increased 30% for the week ending 14 March compared to last year, while pretzels were up 47% and popcorn was up by 48%, according to Nielsen data.