MOVEMENT
Their is a lot of movement in Barcelona because it is one of the most visited places in Europe. People come and go through the city for sight seeing, trade, and looking for a new place to live. First of all 33% of the people that live in Barcelona were not born their. Their are so many different people in Barcelona that they all speak 2 and sometimes 3 languages, because of this they have one of the most diverse shops and markets in the world. People are always coming in to the city looking for a great place to live, that is why they have one of the Fastest growing economies in the world as well. Barcelona, Spain is a big place so imagine all a quarter of its trade coming in to one port. I went to Barcelona last year and i was in a hotel right next to the Ocean and I saw so many ships, cranes, and people. The bad side to so much immigration is that many Spaniards feel that the Immigrants are taking away their jobs. Not all the Spaniards like talking in a different language than Spanish even if they know English. Even though some of the people their dont like foreigners, they make up for it by their loyalty towards their country.
Tourism
Barcelona is home to many historical sights, its the 3 most visited city in Europe. So many tourists are their to get a taste of the Spanish culture. Many Cruises take stops in Barcelona so if you want to visit Barcelona a Cruise might be your best option. The port is always teeming with Cruis lines from around the world. When you go into Barcelona you might notice a lot of tour busses. If you really want to see the city I recommend staying away from the tour busses and going into the real city.