There is nothing in sales quite like a sense of scarcity (thus urgency) to sell a product.

I suggest a new inventory feature to be created of Dynamic Availability where:
- out of total availability, a hotel can define the number/percentage of rooms in each category that are available for initial sale at any one time; and,
- as guests book, a hotel defines the proportion of their inventory that is released for sale (drip fed) at any time (subject to total rooms)
- display on RMS booking engine (like Booking.com does) the number of rooms category you're booking, only "x" number are available
- the feature is available in addition to application of dynamic pricing

Benefits:
- This will have a similar affect on customers that Booking.com's feature has in displaying how many rooms are still available to create a sense of scarcity (although it displays all channel fed availability)
- The scarcity is effectively created across all OTA channels RMS is connected to
- Will allow Hotels to limit the size of Group bookings made online and drive them to direct bookings (simply advise groups to contact the hotel direct for booking enquiries over "x" number of rooms)
- makes it difficult for competitor hotels to determine the price/demand curve for your product.