Why should we study the behavior changes of tourism consumers before and after the epidemic?

Master the laws of the market. The time difference between purchase and travel after the epidemic is longer than before, which shows that the travel decision of users is affected by the epidemic. Why do we need to understand the market rules to study the behavior changes of tourism consumers before and after the epidemic? There are many factors to measure the advantages and disadvantages of travel and more time to consider, so there is a trend to extend the travel date.