On 10 Jun., 10:11, Giovanni Drogo
wrote:

We had a similar case with the introduction of the euro. Before that the
ticket costed 1500 lire. There were law disposition forbidding excessive
price increases with the transition lira-euro. Therefore ATM raised the
ticket from 1500 to 1900 lire on December 29. When two days later the
euro came, the "actual" increase was just from 1900 lire to 1936.27 lire
(1 euro).


On the barcelona Metro there are signs saying things such as the
penalty for not having a cvaild ticket is 30 Euros and 5 cents. No
doubt the result of some very fair currency conversion.