The markets fell last week as investors weighed data about whether inflation was taking hold, including a Department of Commerce report last Friday showing that personal spending growth slowed to 0.1 percent for February, down from 0.8 percent for the previous month. Factory orders also increased slightly, 0.2 percent, after dropping in January. This week brings reports on auto and truck sales and employment, which could make the picture a little clearer. For the week, the index dropped 170.81 points, closing at 11,109.32, down 1.5 percent. The Nasdaq, however, rose 27.32 points to finish at 2,339.79, up 1.2 percent. Ad stocks all finished down. Omnicom lost 1.37 points, closing at 83.25, a drop of 1.6 percent. WPP Group also finished down at 60.01, off 0.84 points, a 1.4 percent drop. Interpublic Group lost 0.79 points to close at 9.56, a drop of 7.6 percent.