Brief introduction of travel expenses law

Travel cost method is a method to evaluate goods without price. Tourism expenses are used to calculate the changes in interests brought by environmental quality changes to tourist destinations, so as to estimate the economic losses or gains brought by environmental quality changes. People usually don't pay or seldom pay for visiting scenic spots. Travel expenses are mainly transportation expenses, time and opportunity costs, etc. Through investigation, the correlation function between the annual number of tourists and the tourism cost is established by regression. Travel cost method evaluates the value of non-market environmental products or services through people's tourism consumption behavior, and takes the sum of the direct cost of consuming environmental services and consumers' surplus as the price of environmental products, which actually reflects consumers' willingness to pay for tourist attractions.