Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
Oil prices was cheaper before the gulf war
It just spiked higher
( z1 cheap :ARG1 ( z2 thing :ARG2-of ( z3 price :ARG1 ( z4 oil ) ) ) :time ( z5 before :op ( z6 war :name ( z7 name :op "Gulf" :op "War" ) ) ) :ARG2-of ( z8 have-degree :ARG1 z2 :ARG3 ( z9 more ) ) )