Are hotel rooms full every day? If not, why not sell it at a discount for a certain period of time?

Of course not. Now there are so many hotels in a market economy that the supply exceeds the demand, all of which are promoting people to settle in under the guise of discounts. If the supply is always in short supply, the room is always full. Do you think they have time to do this? Think about it. Why are you advertising? Why do you want a discount? Why is salt never discounted? Because it is a country, there is only one, and there is no need to discount. The discounts are all based on the shortage of goods, okay? Just think about it yourself.