The ListingSupply.com Seven is simply the sum of the total active listings for seven of the largest MLS systems in the United States.
It is calculated daily. The constituents of the Seven are:

Metropolitan Regional Information Systems (MRIS) - Washington, D.C. area
Southern California MLS - southern California                                                    
MLS of Northern Illinois - Chicago area                                                                 
South East Florida Regional MLS - southeast Florida                                         
First MLS - Georgia and the South                                                                          
Arizona Regional MLS - Phoenix, AZ area                                                              
TREND Philadelphia Metro area - Philadelphia Metro area                               
                              

2009
	January	February	March	April	May
Δ	-20120/-3.35%	3345/0.58%	-3937/-0.67%	-2378/-0.41%	-4151/-0.72%

Total: -27,244/-4.54%

2008
					May	June
Δ					-1968/-0.29%	2532/0.38%
	July	August	September	October	November	December
Δ	-3341/-0.50%	-13068/-1.96%	-1257/-0.19%	-5290/-0.81%	-15793/-2.44%	-30197/-4.79%

Year Total: -68,699/-10.28%
2008 Chart

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