Stocks mostly rose Friday ahead of a closely watched speech by Federal Reserve boss Kevin Warsh that investors will be parsing for clues about the outlook for interest rates amid elevated inflation and no sign of an end to the Middle East crisis. With the euphoria following Nvidia's blistering earnings report petering out, the attention is back on the economy as debate surrounds if or when the US central bank will tighten monetary policy.

Nasdaq Futures Lower Before Nvidia Earnings

US stocks traded flat as investors awaited Nvidia's earnings and assessed hotter-than-expected inflation data. July inflation rose 3.7%, lifting bets on a September Fed rate hike.…