Castles in the Sky

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Castles in the Sky

Slang; a term describing an extremely overvalued security or market. The price rises because investors believe it will keep rising indefinitely. This continues right up to the moment that the price crashes. The term describes a market bubble.
References in periodicals archive ?
A LIVERPOOL dad will build a castle in the sky when he takes to the Gormley plinth.
Castle in the Sky begins ominously: an airship, pursued by a band of pirates, cuts across stormy skies.
Castle in the Sky, based on the movie of the same name, has a dreamy, fantastic air.