BUENOS AIRES, ARGENTINA - MARCH 22: Loli (C, in orange jacket), a guide with Free Walks Buenos Aires, leads tourists through the city center on March 22, 2019 in Buenos Aires, Argentina. Free walking tours, where tourists tip the guide according to their satisfaction rather than paying a per-determined fee are becoming an affordable popular global phenomenon. The guides, who are not usually traditional tour guides, tend to be multi-lingual locals who are passionate in their subject of choice and often take the opportunity to express their own political and economic opinions. (Photo by David Silverman/Getty Images)