As gloom gathered over China’s economic outlook in March last year, Goldman Sachs Group Inc. economist Song Yu declared growth likely had “troughed” and a rebound would follow. The top forecaster on China’s economy was proven right, and sees a repeat this year. “Now it’s very similar to this time of last year in terms of having a combination of monetary, fiscal and administrative loosening,” said Beijing-based Song, ranked the best overall forecaster of China’s economy by Bloomberg Rankings for the past two years.