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Consider the following statement: "An increase in the cost of oil will cause the price of a plane ticket to increase. This increase Macmillan Learn n price will cause a decrease in demand for airline travel and a leftward shift in the demand curve." What is the flaw of this reasoning? O An increase in the price of a plane ticket will not cause a decrease in demand but a decrease in quantity demanded. An increase in the cost of oil will cause a decrease in the price of a plane ticket. A decrease in demand will shift the demand curve rightward, not leftward. O The cost of oil affects supply and not demand, so the price of a plane ticket will not change