In this Tuesday Aug. 28, 2012 photo, staff at CharlieTrotter's restaurant in Chicago are seen preparing for dinner. U.S. service companies grew at a faster pace in August than July and stepped up hiring, further evidence that the economy may be improving. (AP Photo/Sitthixay Ditthavong)

Associated Press
In this Tuesday Aug. 28, 2012 photo, staff at CharlieTrotter's restaurant in Chicago are seen preparing for dinner. U.S. service companies grew at a faster pace in August than July and stepped up hiring, further evidence that the economy may be improving. (AP Photo/Sitthixay Ditthavong)
In this Tuesday Aug. 28, 2012 photo, staff at CharlieTrotter's restaurant in Chicago are seen preparing for dinner. U.S. service companies grew at a faster pace in August than July and stepped up hiring, further evidence that the economy may be improving. (AP Photo/Sitthixay Ditthavong)
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