Writing for Dollars, Writing to Please
http://www.impact-information.com/impactinfo/dollars.htm

Kimble, Joseph
Impact Information
2006

Abstract:

Call it the benefits of plain language. The literature contains studies about these benefits, but no one has ever collected and summarized the studies in a way that makes their full force apparent. As you read the summaries in this article, try to imagine the costs of poor writing — typified by officialese and legalese — in business, government, and law. The costs are almost beyond imagining, and certainly beyond calculating. If this evidence doesn't convince organizations and individual writers that plain language can change their fortunes, probably nothing will.