The Democratic Audit, a research group based at Essex University, estimates that over 300 such groups have been set up since Labour took office in 1997.
He discusses his recent research on audit industry consolidation in this article by Martha Lagace, which first appeared on the HBS Working Knowledge website.
Even so, at least the Anti-Defamation League has provided some kind of baseline in the 25 years since it started its audit, says ADL research director Alan Schwartz.