"Knowledge Workers" (was Re: A mocking look at the social sciences)

[Yoshie Furuhashi]

>The bottom line is, however, that as the supply of knowledge workers
>increases, so does the volume of intellectual commodity they produce, which
>has the net effect of the declining science/drivel ratio.
>
>wojtek

Can anyone give me ballpark figures of just how many "knowledge 
workers" exist in the USA; the ratio of public to private sector 
"knowledge workers"; changes in the number & proportion of "knowledge 
workers"; etc.?

Yoshie