(Marketplace) A single ticket on the Paris Metro costs 1.70 euros -- about $2.15 at today's rate of exchange. Not bad as fares go for a major world-class city. But for some Metro riders in Paris, the actual amount isn't really the point. They don't want to pay at all. It's not about skipping out on the fare itself. It's about whether urban transit ought to cost anything to begin with. From down in the Paris Metro, John Laurenson reports.