Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
Wars in the gulf affect oil prices more than other wars.
( z1 affect :ARG0 ( z2 war :location ( z3 world-region :name ( z4 name :op "Gulf" ) ) ) :ARG1 ( z5 thing :ARG2-of ( z6 price :ARG1 ( z7 oil ) ) ) :ARG2-of ( z8 have-degree :ARG1 z1 :ARG3 ( z9 more ) :ARG4 ( z10 war :mod ( z11 other ) ) ) )