During the heyday of the SONY Walkman (starting in the early 80s I
believe), the growth curve for sales rivaled that of the Apple iPod.
My market research question relates to comparable sales and growth
during that same period of SONY car audio products, especially SONY
car stereos with cassette players in them. Standard AM/FM after market
radios should be included in the data. I am doing a paper on this
topic and haven't been able to find the data anywhere. I need to
report on both sales and unit growth of the car audio products as
compared to the original Walkman. Any information would be greatly
appreciated.