"What can be sustained?" is the big question asked by Nuveen Asset Management’s Chief Equity Strategist Bob Doll. "U.S. equities struggled last week as the S&P 500 was down approximately 1%. The weak jobs report released on Friday seems to indicate that the U.S. remains mired in a muddle-through economy. After a couple of months where signs were more positive, recent data is disappointing. Although the first quarter was relatively strong, we anticipate that the first and second quarters will average out to the 2% to 2.5% real growth we have been forecasting, with nominal growth under 5%."