Languages of Catalonia
The main cause of Spanish and Catalan social bilingualism in modern Catalonia was large-scale migration from the rest of Spain during the 20th century, as Catalonia started a significant industrialization which demanded an increased workforce from elsewhere. Spanish has historically been spoken among a minority of civil servants born in other regions in Spain and among segments of the wealthiest bourgeoisie. Spanish has also been spoken as a second language by most Catalans, as it has been the only official language over long periods since the eighteenth century.
Catalonia
Today, Catalan is the main language of the Catalan autonomous government and the other public institutions that fall under its jurisdiction. Basic public education is given in Catalan, except for two hours per week of Spanish medium instruction. Businesses are required to display all information (e.g. menus, posters) at least in Catalan, under penalty of fines. There is no obligation to display this information in either Occitan or Spanish, although there is no restriction on doing so in these or other languages. The use of fines was introduced in a 1997 linguistic law that aims to increase the public use of Catalan and defend the rights of Catalan speakers.