there has been a phenomenal growth in the sale of CD . Sales were up almost 150 percent in the first half of 1986 as compared to the first half of 1985 . While fewer than 6 million CDS were sold in the US in 1984 ,there were approximately 50 million sold in 1986. The sales would likely be even higher were it not for the price:CDS cost nearly twice as much as LPS in the near future.However , price should lower as more production facilities open.