Every time I buy a new electronic device, PC and accessories in particular, I can’t help thinking about the price development and the fact that despite the price pressure, the end customer always pays the same about of money for the same product class over the years. It seems a bit complicated to explain but I found that someone else have spent a lot of time on the subject.
Matt Komorowski made some history research and collected data for the price of a hard drive over the years (price per GB). The diagram below shows the hard drive cost per gigabyte from 1980 to 2009.

Not strange for a mathematician and software engineer like Matt to formulate the graph in a mathematic equation that gives the price of hard driver per gigabyte storage over the years between 1980 and 2009. Most likely, this expression can be extended to the future as long as the consumer electronics follow the same trend. So you can predict how much the price of a hard drive would be in 2020…

Price = 10^{-0.2502(year-1980)+6.304}

Anyway, back to my idea, if you plot the “mass-production” available storage capacity by year on the right y-axis, I believe you will a linear line rising from 1980 to 2009 that will cross the blue line somewhere between $150 and $300 which corresponds to the average price of an average hard drive over the years.
I don’t share the enthusiasm as Matt to look up data and plot them to see if it matches my theory, but probably some other statistic freak out there might do it and share it or even prove that my theory is wrong..