The fundamental problem with public transport is not that workers are overpaid but that we are trying to do the impossible, make public transport operate as a commercial service. No country in the world has ever succeeded in doing this. The only debate is about how to quantify the public good of public transport and how to put prices on its benefit to the environment and other benefits. That is a difficult area about which I know a little. Environmental accounting is extremely difficult and dubious. The justification for subsidising public transport is overwhelmingly environmental. In order to quantify the benefit, therefore, one must be able to quantify the environmental benefits. We know they are real and tangible but whether it is possible to put a cash value on them at this stage in an underdeveloped science like environmental economics is doubtful.