Fed chair says trade tensions and slowing global growth have weighed on the economy
A weaker dollar could help exports, but hurt foreign investments in government debt
But growth is expected to be slower the rest of the year
The Fed chair did not commit to a rate cut but said the central bank will closely monitor incoming data
Trade conflicts, especially with China, could lead to a rate cut
Gain was more than double the productivity growth in Q4 2018
His comments raised expectations for at least one interest rate cut before year's end
Personal income growth increased by 0.5%
Growth expected to be slower in Q2