medium · SAT Reading & Writing

A 2022 study by environmental economist Dr. Marcus Thorne examined the impact of 'congestion pricing' in several European cities. Thorne found that charging drivers a fee to enter city centers during peak hours led to a 15% reduction in traffic volume and a measurable improvement in air quality. However, Thorne also noted that the policy was often unpopular among low-income commuters, who had fewer alternatives to driving and were disproportionately burdened by the additional ________.

1. Convenience
2. Negotiation
3. Expenditure
4. Revenue

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