How far will US car sales drop without 'clunkers'?

Most analysts believe that now that the "Cash for Clunkers" program has finished that domestic car sales will drop. But, how far?

In the first six months of the year, U.S. vehicles sales were running at a rate of only a little above nine million a month. July was a different story. The annual run rat moved up to closer to 11 million. The drop in vehicle sales compared to 2008 improved from 32% in the first six months to only 12% in July.