I'm trying to get an idea of the quantitative parameters of the computer industry in the era that saw the rise of personal computers. Of course, the industry as a whole was old by then; companies like Intel got their start in large part by selling RAM chips for minicomputers and mainframes; there was even a debate within Intel in the early seventies about whether the company should be doing microprocessors, versus just staying focused on the RAM chips that were the profitable business.
I think the one specific quantitative question that could sum it all up is: how much RAM was sold, in total throughout the world, each year during the seventies? Every computer uses memory, and it was not far into that decade before every computer, from the largest to the smallest, was using semiconductor memory. There are certainly figures available on the price per kilobyte of RAM, but it seems to me that people involved with the industry must have gathered at least estimates of the total amount sold each year. If there isn't an available estimate for total worldwide sales, it would still be interesting to see figures for the major manufacturers like Intel and Mostek.