Where are the moral limits to taxation?

In a previous entry we talked about the increasing number of primary school students that bring their lunch from home because their parents can’t pay the school canteen bill. Some regional governments as Catalonia or Valencia (the most of education competences are in their hands) have announced that every student which brings his meal from home to have lunch at school will pay ad hoc taxes. This measure is focused to balance public deficit.

At the same time, the Spanish government allows money laundering to tax-evaders.