A hotel room quoted at one price in the morning can carry a different price by the evening. The movement is generated by software responding to how bookings are arriving against a forecast.
Tonight's room cannot be sold tomorrow
Each room is a separate product for each night, and once that night passes the opportunity is gone permanently.
The hotel's costs barely change whether the room is occupied or empty, so almost any rate above the cost of servicing the room beats leaving it unsold.
That creates a strong bias towards cutting prices as the date nears, provided the hotel is confident it will not otherwise fill.
Forecasts are built from booking curves
Revenue systems hold a picture of how a given date normally fills: how many rooms are usually sold sixty days out, thirty days out, and in the final week.
The current pace is compared against that curve continuously, and a date running ahead of pace signals unmet demand while one running behind signals the opposite.
Rates are then adjusted in the direction the gap indicates, which is why prices can move several times in a single day without anything visible happening in the city.
Events change the whole curve
A conference, a tournament or a festival lifts demand across every hotel in an area simultaneously, and systems raise rates well in advance of such dates.
The size of the increase depends on how much of the city's capacity the event absorbs, since a large event in a small market leaves nowhere else to go.
Hotels also watch competitor pricing directly, so an increase at one property tends to propagate through the area within hours.
Not every guest pays the moving rate
Corporate contracts, group bookings and negotiated agency rates are fixed in advance and do not move with the daily calculation.
Those fixed bookings form a floor of committed occupancy, and the fluctuating public rate is applied only to the rooms left over.
A hotel with a large contracted base therefore prices its remaining inventory far more aggressively than one selling mostly to the public.
Why late discounts are less common than expected
Deep last-minute cuts train guests to wait, which damages the more profitable advance bookings the hotel depends on across the year.
Systems are consequently set to protect the rate structure, and surplus rooms are more often released quietly through opaque channels that do not display the property's name.
The room still sells cheaply, but the headline rate is left intact, which preserves the price the same hotel can charge on the next comparable date.