U.S. light crude was trading erratically on the New York Mercantile Exchange, hitting $44.50 a barrel before easing back a bit to $44.10, still a gain of $1.27.
U.S. light crude is a risky investment.
( z1 invest :ARG1 ( z2 crude :ARG1-of ( z3 light ) :mod ( z4 country :name ( z5 name :op "U.S." ) ) ) :ARG1-of ( z6 risky ) )