Amazon's faster AWS growth and broader profit support its investment case, but returns on infrastructure spending remain uncertain. AWS supplied about 60% of the $10.7B rise in operating income and North American retail about 37%. Trailing net capex of $210.7B exceeded $168.3B of operating cash flow. Much of the spend is on chips and servers with lives well under a decade; the test is how quickly capacity becomes AWS revenue. x.com x.com x.comÂ