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An urban planner wants to study the isolated impact of a 10% decrease in bus fares on public transit ridership in a city. To do this effectively, the planner must assume other relevant factors are held constant. Which of the following concurrent events would most significantly violate this assumption and make it difficult to determine the true effect of the fare change?
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An urban planner wants to study the isolated impact of a 10% decrease in bus fares on public transit ridership in a city. To do this effectively, the planner must assume other relevant factors are held constant. Which of the following concurrent events would most significantly violate this assumption and make it difficult to determine the true effect of the fare change?
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