Federal Reserve Chair Jerome Powell's speech at Jackson Hole on Friday morning was setting off a broad rally on Wall Street, but it’s been small-cap stocks shining the brightest. Small-cap stocks, as measured by the benchmark Russell 2000 index,

U.S. stock index futures edged higher on Friday, recovering slightly from the previous session's losses as investors awaited Federal Reserve Chair Jerome Powell's address at the Jackson Hole Symposium for clues on the interest-rate path.