A second half recovery is suddenly not a sure thing An end to the green-shoot rally? By Greg Robb, MarketWatch WASHINGTON (MarketWatch) -- For months, policymakers from Federal Reserve Chairman Ben Bernanke on down told investors that a second-half recovery was a safe bet. Investors, optimists by nature, eventually bought in. But now, even though the second half has actually arrived, the curtain on the recovery has so far remained down and questions are being raised on whether it will go up at all. Suddenly notable economists say the whole thing might not happen. Others, including Harvard economist Martin Feldstein,...