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In page Barcelona:

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While tourism produces economic benefits, according to one report,[citation needed] the city is "overrun [by] hordes of tourists". In early 2017, over 150,000 protesters warned that tourism is destabilizing the city. Slogans included "Tourists go home", "Barcelona is not for sale" and "We will not be driven out". By then, the number of visitors had increased from 1.7 million in 1990 to 32 million in a city with a population of 1.62 million, increasing the cost of rental housing for residents and overcrowding the public places. While tourists spent an estimated €30 billion in 2017, they are viewed by some as a threat to Barcelona's identity.[10]