preboom

From pre- +‎ boom.

preboom (not comparable)

1. (economics) Before a boom
   • 2009 January 17, Andrew Jacobs, “A County in China Sees Its Fortunes in Tea Leaves Until a Bubble Bursts”, in New York Times‎^[1]:

     From 1999 to 2007, the price of Pu’er, a fermented brew invented by Tang Dynasty traders, increased tenfold […] before tumbling far below its preboom levels.