What are the commonly used indicators to measure tourism development?

1) Number of tourists

(2) Tourism income and expenditure

(3) Number of days tourists stay 8. Briefly describe the common methods of counting tourist numbers .

(1) In terms of statistics on the number of outbound tourists (times) of domestic residents, the common international practice is for the country to conduct statistics through sampling surveys when these outbound tourists return to the country.

(2) Regarding the number of domestic tourists, countries around the world conduct statistical calculations through regular domestic tourism sampling.