A labor shortage is looming over this year’s holiday shipping season, and it may be particularly acute for cyber-shoppers. The WSJ’s Laura Stevens and Loretta Chao write that staffing agencies for logistics companies and retailers say they’re having trouble hiring warehouse workers to stock early holiday inventory and employees to train seasonal hires in fulfillment centers where holiday orders will be packed and shipped. Companies and staffing agencies have had to raise starting pay and some are hiring earlier than usual to get their business plans moving and their goods in place. The need for warehouse workers has grown as e-commerce sales have skyrocketed in the past decade. But the online orders up the ante on hiring because it raises the difficulty of the warehouse jobs, demanding more picking and packing and intensive work in distribution centers. The competition for the workers also is more intense—e-commerce fulfillment are close to population centers, and operators in logistics clusters are competing for the same workers.