Amazon is funding considerable increases in its capital expenditures with an even larger step-up in operating profit gleaned from tight cost controls, UBS analysts say in a research note. The company is controlling its headcount to keep operating expense growth low and expand margins, they say. The company’s capex jumped 80% to about $23 billion in 3Q as Amazon Web Services invests aggressively in AI infrastructure to meet high demand, Davidson analysts say in a research note. But Amazon’s cloud unit has a lot of price efficiencies in its chips that are less expensive to implement, they say.