摩根大通4月全球制造业PMI 49.8，前值 50.3。

Group 1 - The core point of the article indicates that JPMorgan's global manufacturing PMI for April is reported at 49.8, a decrease from the previous value of 50.3, suggesting a contraction in manufacturing activity [1] Group 2 - The PMI value of 49.8 indicates that manufacturing activity is below the neutral level of 50, which typically signifies a contraction in the sector [1] - The decline from 50.3 to 49.8 represents a notable shift in manufacturing sentiment, reflecting potential challenges in the industry [1] - This data point may influence investor sentiment and market expectations regarding economic growth and manufacturing performance [1]