I'm looking for a few studies, articles, etc. that discuss the impact
of productivity improvements on the economy.  For instance, I seem to
recall having read things like a 1% increase in productivity would
result in a $5,000 (I just picked that number arbitrarily) increase in
average household income.  Although I know that I've read these things
before I can't seem to dig up the articles anymore.  I'm looking for
at least three readings/studies/articles that concern this topic and
would consider that to be a satisfactory answer.