The economic boom is facing some bottleneck such as supply and there are already signs that supply bottlenecks may lead to nasty surprises which could upset the post-pandemic recovery. Nowhere are shortages more acute than in America, where a boom is under way. Consumer spending is growing by over 10% at an annual rate, as people put to work the $2trn-plus of extra savings accumulated in the past year. More stimulus is still being doled out. The global economy is entering unfamiliar territory. After a decade of worries about inadequate demand and spending power in the aftermath of the global financial crisis, signs of insufficient supply are now emerging. How can the supply chain bottleneck be handled ?