Hong Kong has an efficient transport system. There are buses from the airport going into town, and there’s also an express train. One thing I learned from someone In the hotel I stayed in, was the discount you get if you buy a ticket for two or more people traveling together.
This discount for more than one, offer is found in some other places and countries. The purpose usually is to encourage more use of public transport, reducing the number of cars on the road. Hopefully.