Shoppers in major metropolitan areas have noticed a frustrating and persistent shortage of a basic household staple: Ziploc bags and other resealable plastic baggies. While the problem is less severe in suburban and rural areas, the shelves in big-city grocery and convenience stores are often empty. This is not a sign of a new hoarding craze. It is the result of a complex mix of supply chain problems that are uniquely affecting the delivery of goods to dense, urban centers.
