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The four factors of production are land, labor, capital, education.

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A boy who traveled from Tianjin to Beijing was an domestic tourist.

Tourists' arrivals are the only indicator to measure tourism.

The role of active involvement in tourism development is that government intervenes in the sector as an investor, to provide infrastructure and supportive services including tourism policy and planning, human resource development, marketing, etc.

Sustainable development of tourism products is important with the fast development of tourism industry in China.