Stock indices hit four-year highs Friday, thanks in large part to acquisition news and strong earnings by Hewlett-Packard Co. Oil prices continued to fall, easing fears that consumers might hold back spending during the holiday season. But some investors held concerns about long-term growth after mixed news on inflation and retail spending. Despite falling earlier in the week, the Dow closed up nearly 80 points Friday at 10,766.33, a 0.75 percent gain. The Nasdaq also finished at 2227.07, gaining 23.28 points, a 1.12 percent gain. Advertising stocks, however, all finished lower, with Omnicom closing at 81.14, down 1.81 points, a 2 percent drop. WPP Group, trading as American Depository Receipts, finished the week down 0.74 points to close at 49.66, a 1.4 percent drop. Interpublic Group closed the week off nearly 10 percent, finishing at 9.85, a 1.05 point drop.
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