"The authors of the Case-Shiller index had assigned the index a value of 100.0 in January of 2000. This figure does not represent a dollar value for home prices but is simply a benchmarking tool. In December 2008, after a severe 28% decline from its June 2006 peak of 226.29, the Case-Shiller 10 City index stood at 162.1. However, if home prices had followed the 3.4% annual 100-year trend line from December 1997 (when the index was at 82.3), then the index would have arrived at only 118.92 in December 2008."
"This would suggest that the index would need to decline an additional 27% to get back to the historical trend line. Extrapolating along the sunnier 50-year annual average increase would put the index at 132.2 by December 2008. This would still put the trend line 18.5% below current prices."
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