Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
The Gulf War wasnt associated with a price increase
( z1 associate :polarity - :ARG1 ( z2 war :name ( z3 name :op "Gulf" :op "War" ) ) :ARG2 ( z4 increase :ARG1 ( z5 price ) ) )