What was the mistake that the governments of the U.K.and France made when they subsidized the Concorde,a supersonic aircraft manufacturer?

Question

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The mistake made was that the market for supersonic aircraft was not large enough to justify the amount of government subsidies provided for the Concorde project. As a result, the aircraft was not widely adopted by commercial airlines and the project became a financial failure.

What Was the Mistake That the Governments of the U