Support from the U.S. for a waiver from COVID-19 vaccine patents is a necessary but not sufficient condition for success in rolling out global vaccines. Chinese air freight restrictions could damage global pharmaceutical supply chains. Also: U.S. supply chain activity throttles back after record month, still powers ahead; GM looks to control the chip as semiconductor shortage cuts Mexican deliveries; Vivo battery ban may drag on Indian phone supply surge; Biden may preserve Trump’s investment legacy; China’s tech-led export boom continued in April; Brazil calls foul over Saudi import dec...