white market

noun
  1. (in a system of rationing) the buying and selling of unused ration coupons at a fluctuating legal price based on the supply of and demand for the rationed commodity.
Compare black market.

Origin of white market

First recorded in 1970–75
Related formswhite-mar·ket, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018