Tourism and its impacts on city life and on the landscape, culture and economy of host countries is the focus of the third issue of Electra. Geographer Álvaro Domingues traces the long history of the tourism phenomenon; French urban planner Thierry Paquot defends the disruption of the growing movement of world tourism; António Baião and António Pedro Marques analyse so-called 'ethical tourism'; economist and researcher Álvaro Matias reveals the numbers to examine the impacts of the tourism economy; French sociologist and ethnologist Jean-Didier Urbain discusses the figure of the tourist and the experience of the trip. Italian philosophers Emanuele Coccia and Andrea Cavalletti comment on the definition of goods present in the work Capital, and historian José Neves examines the complex inheritance that Marx has left us. In the Diagonal section, biologist and researcher Vasco Barreto and professor of Portuguese and Brazilian studies Pedro Schacht Pereira analyse the question of race from the viewpoints of science and postcolonial studies.