Yes, but HAL is regulated so it is prevented from pushing up prices. As a result, the economic rent (ie excess profits) that results from the imbalance between supply and demand flows through to the LHR airlines. This largely explains the whopping slot values we see at Heathrow, not to mention BA's high profits (despite it not being a particularly efficient airline).
In the end the consumer pays for the decades of indecision on LHR expansion.
Last edited by BasilBush; 1st Mar 2015 at 10:36.