boom and bust

Short definition from Wiktionary

Noun

1. 1
   A pattern of high prices in a given market or in the entire economy followed by ruinously low prices, falling production, and bankruptcies by producers; prosperity followed by recession.

Adjective

1. 1
   Featuring or characterized by a boom and bust cycle in a market or an economy, in which rapid price increase is followed by falling prices or recession.