Why can't the economy of a big country rely too much on tourism?

Tourism belongs to the tertiary industry, covering a wide range, while tourism only accounts for a small part, and the service industry is the tertiary industry.

If a country relies too much on tourism, its agriculture, light industry and heavy industry will be unbalanced, which will lead to the imbalance of the supply of means of production and means of subsistence and the instability of prices.

Tourism is an export-oriented economy. In 2002, when severe events such as SARS and the Pacific tsunami occurred, the tourism industry was almost in a state of collapse. Don't you know that Thailand was hit hard after the Pacific tsunami? Besides, it is not entirely dependent on tourism. Therefore, if an economic power wants to be in an invincible position economically, it must have a complete economic category and a reasonable structure, so that the disadvantages will be less and it will be easy to govern. Otherwise, it will restrict economic development and eventually become a bottleneck restricting economic development. For example, a person needs coordinated development in many aspects, and it is this truth to be a compound talent. Professionals are often in danger of losing their jobs.