... the ABI is a pretty good leading indicator of non-residential construction levels a year or so down the track. It’s often not a bad indicator of broader economic conditions either. For example, the index’s low of late 2008 came a little before U.S. stocks’ post-crisis nadir in March 2009. It’s been on a general uptrend ever since. As have stocks. There’s a crumb of good news, here, then, because the ABI has now been rising for four straight months. — blogs.wsj.com
The WSJ's "The Source" discusses how the Architecture Billing Index can be used as a fairly accurate economic indicator, comparable to the oft-used Baltic Dry Index.