Research on the Spatial Structure of the European Union's Tourism Economy and Its Effects.

(3) The core areas are mainly concentrated in Western Europe, Southern Europe, Mediterranean mainland countries and Central Europe, while the marginal areas are mainly concentrated in Eastern Europe, Northern Europe and Mediterranean island countries; the network connection density of the core area, the network connection density of the marginal area, and the network connection density between the core and marginal area overall show an increasing trend.

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Tourism economic ties between member states were gradually strengthened and showed a trend towards centralized development.

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