Wall Street ticks up on economy bets; Brexit fear ebbs

U.S. stocks rose on Tuesday, led by gains in technology shares as Federal Reserve Chair Janet Yellen was optimistic about the economy and played down the risk of a recession, while concern over the upcoming British referendum remained subdued. Yellen, however, warned that the British vote on Thursday on whether to stay in the European Union, alongside a U.S. hiring slowdown, posed risks to the economic outlook. The sentiment swings back and forth and right now it is swinging toward 'remain' and