美国7月挑战者企业裁员人数同比 139.8%，前值 -1.6%。

Core Insights - In July, the number of layoffs reported by U.S. companies increased by 139.8% year-over-year, contrasting sharply with the previous value of -1.6% [1] Group 1 - The significant rise in layoffs indicates a potential shift in the employment landscape, suggesting companies may be facing economic pressures [1] - The year-over-year comparison highlights a dramatic change in workforce management strategies among U.S. firms [1] - The previous negative value suggests that the labor market was relatively stable prior to this increase, raising concerns about future employment trends [1]