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International tourism is defined as crossing national borders to travel or stay for reasons other than regular work, residence, or immigration, in a country other than one’s own, for more than 1 day but less than 6 months (though some say less than 1 year). It is the world’s largest movement of persons, goods, and services, and is closely related to globalization. Travel and passenger transport make up one-third of the world’s service exports and more than 5% of all exported goods and services. For more than four-fifths of the world’s countries, international tourism is among the top five export industry categories (together with fuels, chemicals, food, and automotive products). It is the most important export category for one-third of the world’s poorest countries.

In 1950, ...

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