Number of cars per person is not a reasonable metric. In a family of four with a single working parent the driver is the minority but brings home 100% of the in

Number of cars per person is not a reasonable metric. In a family of four with a single working parent the driver is the minority but brings home 100% of the income. People in Paris can commute without cars because they have alternatives, unlike many people living in other parts of the country. (in other words, those who have to drive a car are those who cannot afford to live in Paris)