Market forces vs. 'The Plan'
Are there not parallels to be drawn between shortage of runways (Heathrow, Gatwick and Stansted) and the subsequent selling of slots and WWII Rationing and the subsequent black market? (Same thinking applies to planning laws and the collapse of new house building in the UK causing building land overpricing and corruption in getting planning permissions).
What would be the result if the 3 London airports were given an extra runway each?