However, in a market where the equilibrium price is $5 and the price floor is set at $4, there will be no effect on supply because the price floor must be set higher than the market price in order for it to have an effect on inventories.
In 1983, the portable CD player came as a boon for those who liked to listen to their choice of music while on the go.
Variations of the optical disk and compact disc started to appear in the late 1970s. The ones we are used to were launched in 1982.http://wiki.answers. com/When_was_the_CD_and_CD_player_invented&action=edit The first CD or compact disc was invented in the year of 1982.