The tourists must have purchase authority requirements and are willing to pay for goods and services. The quantity of goods and services increased or decreased mean increasing or decreasing of travel demand.
Visitors are required to have the purchasing power and are willing to pay for goods and services. The volume of goods and services increased or decreased by the increase or decrease in demand for tourism.
The tourists must have the demand, purchasing power and willingness to pay for goods and services. The quantity of goods and services increased or decreased, means to increase or decrease of the demand for tourism.