The Dow Jones industrial average saw a gain of more than 100 points last week even after losing 66 points during Friday’s trading session. That drop was triggered by the release of a University of Michigan survey showing a steep decline in consumer confidence. Earlier in the week, Federal Reserve Chairman Alan Greenspan said the economy is growing and suggested that interest rates would remain stable, pushing the Dow to its highest level in two and a half years. On the Big Board, Omnicom shares were up 2.2 percent, closing the week at $83.10, while IPG climbed 0.6 percent to finish at $16.92. British holding company WPP, trading as American Depository Receipts on the Nasdaq, saw its stock rise 1.3 percent to close at $56.94.