Global economy: Wall Street rallies on chip rebound but oil at $91 and firm dollar tighten the vice. Brazil high Selic cushions real; Asian tech data lifts m...

Global economy: Wall Street rallies on chip rebound but oil at $91 and firm dollar tighten the vice. Brazil high Selic cushions real; Asian tech data lifts m...

(Bloomberg) -- A global selloff in technology stocks gained momentum as doubts over returns from billions of dollars spent on artificial intelligence were compounded by a surge in…