Jose,
Castells unfortunately does not seem to give a full reference for the BLS number he cites:
"For instance in the US in the 1990s the banking industry, according to Bureau of Labor Statistics, increased its productivity by about 2% a year. But this calculation seems an underestiamte, because growth in real ouptu in banking and other financial services is assumed equal to the increase in hours worked bin the industry, and therefore labor productivity is eliminated by assumption." Here Castells cites the Council of Economic Advisers (1995). Economic Report to the President of teh United States. Transmitted to the Congress, February 1995, Washington DC: Govt Printing Office, pp. 95-127 Perhaps the BLS is quoted herein.
I am quoting Castells, The Rise of the Network Society (1996). p. 75
Another fascinating Berkeley work on the information age seems to be Gene Rochlin's Trapped in The Net. Hmmm.
Yours, Rakesh