It's difficult to measure because my anecdotal understanding is that a lot of boutique consulting firms have been absorbed by the bigger ones, kind of like what happened with law firms. Therefore, it may be difficult to sort of measure from time to time.
I think what's happened is a growth in both the amount or volume of work and the pace of work. If people want to use fewer consultants, then they have to slow down and be clear on what they are willing to do less of.