Rather than what every economist has been screaming for a decade or more: change just the oneprice in the system, the price of carbon emissions, and let the market work out what to do next.
According to Roger Wallis of London's City University Business School, Europe's collecting societies work rather like the postal system: oneprice for all destinations, one administrative charge for everybody.
Some of the most auspicious reforms that health policy experts believe will transform the health care system from one that delivers more care at an increasingly growing price to one that delivers better care are not analyzed by CBO for the fiscal effects.
Arbitrage across price regimes sees to that and so one or the other need to go for the system to, well, for the system to do what it is supposed to do which is get the necessary drugs to ill people.
But the contactless payment system will not include daily price capping, which means if it is used several times in one day it will not stop charging once a passenger reaches the cost of daily travelcard.