To add to everyone else talking about logistics network efficiency, stores have a metric for ‘days of inventory’ in the building. It adds up the price of everything they have, and subtracts an average day of sales until the store hits 0.

For most grocery stores, the number is somewhere between 6 and 10. A big box store might push the number to 14.

If they stopped getting trucks today, your local grocery store is probably empty in a week.