Many Catalans do not consider themselves Spanish but exclusively Catalan. Such feelings raise eyebrows in other parts of Spain, Europe and elsewhere, but are widely accepted as legitimate within Catalonia.
There are broadly three main arguments for the independence of Catalonia.
The first is that since the Catalan cultural and language is neither understood nor accepted in Spain (and so neither protected nor fostered), the best way forward is an independent state. This results from three centuries of linguistic and cultural discrimination, which reached its pinnacle under Gen. Francisco Franco's 36-year dictatorship.
The second one says that a well-defined political entity such as Catalonia should be mature enough to govern itself with its own voice in the European Union or the United Nations in order to address the problems specific to it.
Finally, there is the belief that Catalonia would be better off economically by seceding. In particular, proponents of the last argument refer to the fact that Catalonia pays much more into Spain's central treasury than it gets back (subsequently referred to here as the fiscal imbalance) and to the excessive bureaucracy resulting from the current administrative arrangements.
... In conclusion, there is no objective economic reason to believe that a hypothetical Catalan state should not be viable from an economic perspective. If Slovenia has performed well since seceding from Yugoslavia with its much smaller and less diversified post-communist economy, an independent Catalonia should also be able to do well economically. In the end, the success of a Catalan state will depend on its own government. Independence will be good for Catalans only if the Catalan state would be able to pursue sound macroeconomic policies that foster growth and economic welfare.
If Spain is not big enough to tackle global problems and not small enough to properly deal with Catalan specificity, then it should change or disappear. So far, it has shown no willingness to change. As professor Sala-i-Martín puts it: "at the end of the day, states and governments should serve the people and not the other way around."
We have seen how the European Union is calling into question the existence of old centralized European states such as Spain. In this context, becoming a small less bureaucratic state within the European Union would result in increased economic efficiency. It would also be the best way for Catalan interests to be represented in the process of European construction - as opposed to being represented by a Spanish government that has repeatedly refrained from defending important Catalan interests
The process of European integration also provides a significant argument for the independence of Catalonia, Flanders or Scotland: administrative efficiency. The maintenance of the state's intermediary role between the European and local powers results in higher transaction costs that hamper economic development. Particularly in federal or semi-federal states like Spain or Belgium, keeping a central state that has less and less to offer to its citizens is becoming more expensive to maintain and very complex to manage. Thus, secession appears as an economically desirable option because it would result in lower costs and complexity that would reduce the burden carried by the Catalan economy.
We have seen how the European Union is calling into question the existence of old centralized European states such as Spain. In this context, becoming a small less bureaucratic state within the European Union would result in increased economic efficiency. It would also be the best way for Catalan interests to be represented in the process of European construction - as opposed to being represented by a Spanish government that has repeatedly refrained from defending important Catalan interests (e.g. language official recognition). Finally, the European Union is de facto lowering the potential cost of independence by providing Catalonia with a free trade area, as well as saving the need to incur costs such as creating a new currency.
No referendum on the question of independence will be a fully rational exercise. Independence from Spain is not simply a matter of economics or administrative rationality. Identity issues, in Catalonia and elsewhere, are highly complex. Some might want to be part of Spain even with an unfair fiscal treatment; others might want independence even if the cost is high. However, this does not negate the fact that economically, independence would not only be viable, but also significantly advantageous. Catalans might want to vote from their pockets rather than from their hearts.