It is similar to the numbers calculated by Ivan Illich regarding car usage in the 1970's. If you take into account the car price, gasoline, insurance, repairs,

It is similar to the numbers calculated by Ivan Illich regarding car usage in the 1970's. If you take into account the car price, gasoline, insurance, repairs, etc, and the time spent to earn that amount of money, the average speed of a car for a worker was around a few miles per hour, so not better that simply walking or bycycling. It is an unorthodox but quite interesting perspective on the counter productivity of complex industrial societies. The better your pay is, the higher is your "average speed". The Concord is only the most extreme example of this trend.