U.S. stocks were set to open higher on Monday after China announced measures to support its ailing markets, but markets remained cautious ahead of economic data expected later in the week due to determine central bankers’ next steps. Beijing on Sunday said it would halve the stamp duty on stock trading, in its latest move to boost the struggling market and following its steps to support housing. China’s securities regulator also approved the launch of 37 retail funds. S&P 500 futures edged up 0.1% while Nasdaq futures rose 0.2%, indicating last week’s