World shares struggled to extend a bounce off four-week lows on Tuesday, oil prices flirted with their highest levels over two years, while indecisive bond markets flip-flopped on inflation and interest rate moves. All eyes are on Fed chief Jerome Powell who appears before the U.S. Congress from 1800 GMT, as investors eyeing the second half of the year juggle his vow to keep up monetary stimulus while the job market recovers with data showing inflation on the rise and Fed officials projecting rate hikes sooner than once thought.
