Lean times faced by many U.S. and European companies may last longer than expected as they try to sell off their bulging inventories in an economic climate where demand is stalling. Full-to-bursting warehouses means fewer orders for manufacturers, which translates into lower levels of business activity and, ultimately, weaker growth. The high stock levels are the result of retailers, wholesalers and manufacturers stockpiling everything from beer to DIY tools, chemicals and clothes as COVID-19 lockdowns snarled supply chains and shut factories.