We forget now that Concorde was a politically-motivated attempt to demonstrate that the UK and France were still relevant in the aerospace industry and the project itself was plagued with costly development inefficiencies due to the desire to split the work between the UK and French participants. E.g. working in both metric and imperial units. Building parts in multiple factories.
The Soviet equivalent (Tu-144) crashed and burned at the Paris air show and never had any economic justification. The Boeing 2707 was cancelled before it even flew because of cost overruns following the failure of an abortive swing-wing design. Concorde itself only became profitable to operate when the govt wrote off the development costs in 1983 in a deal described as "among the most disastrous conducted by a government minister" [0].
[0] https://en.wikipedia.org/wiki/Concorde#British_Airways_buys_...