Analysis of information sources in references of the Wikipedia article "Concorde" in English language version.
The programme's cost, through March 1976, was put at between 1.5 and 2.1 billion in 1976 pounds sterling, or between 3.6 and 5.1 billion in 1977 U.S. dollars (yearly weighted exchange rates)
Jock Lowe (Concorde Chief Pilot): We did some research which showed that the Concorde passengers actually didn't know how much the fare was. When we asked them to guess how much it was, they guessed that it was higher than it actually was, so we just started to charge them what they thought they were paying anyway.
The programme's cost, through March 1976, was put at between 1.5 and 2.1 billion in 1976 pounds sterling, or between 3.6 and 5.1 billion in 1977 U.S. dollars (yearly weighted exchange rates)
Jock Lowe (Concorde Chief Pilot): We did some research which showed that the Concorde passengers actually didn't know how much the fare was. When we asked them to guess how much it was, they guessed that it was higher than it actually was, so we just started to charge them what they thought they were paying anyway.