The rivalry comes about as Madrid and Barcelona are the two largest cities in Spain, and they are sometimes identified with opposing political positions, with Real Madrid viewed as representing Spanish nationalism and Barcelona viewed as representing Catalan nationalism.[5] The rivalry is regarded as one of the biggest in world sport.[6][7][8] The two clubs are among the richest and most successful football clubs in the world; in 2014 they were ranked the world's two most valuable sports teams.[3] Both clubs have a global fanbase; they are the world's two most followed sports teams on social media.[9][10]
